Reindent and unify codebase to 2-space indentation.

- replace font-awesome icons with octicons
- clean up js and css surrounding the code expansion and file folding
- fix hover color on arc-green
- tweak diff line number colors

Co-authored-by: zeripath <art27@cantab.net>

* Fix missing styling for dropdown icon on review button

* Remove unnecessary span element

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Fix #11704

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-Authored-By: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>

Introduced naively by #11463

The margin was being applied too widely.

Enabled the rule and --fix'ed issues.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Co-authored-by: Lauris BH <lauris@nix.lv>

* Better styling for code review comment textarea

* align tabular menu with textarea

* border around active tab instead of textarea

* border radius

* use .28571429rem

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* update #8659 fold/unfold code diffs

* add fold button style

* update #8659 implement expand up/down codes (blob excerpt)

* fix golint errors

* fix expand direction

* remove debug message

* update css style for blob exceprt

* fix typo in comment

* update style sheet with less

* update expect diff (add SectionInfo)

* update #8942 accept suggested change (fix typo)

* close reader and check file type before get tail section

* adjust button position and check file type before insert fold button

* move index js to web_src

* merge index.js with master

* generate index.js

* update js coding style

* Add lang specific font stacks

* Force font changes

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Fix icons

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Fix octicons and icons

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Just override the semantic ui fonts only

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Missed the headers... override them too

* Missed some more semantic ui stuff

* Fix PT Sans

Signed-off-by: Andrew Thornton <art27@cantab.net>

* More changes

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Squashed commit of the following:

commit 7d1679e907
Author: Mike L <cl.jeremy@qq.com>
Date:   Wed Mar 13 13:53:49 2019 +0100

    Remove missed YaHei leftover from _home.less

commit 0079121ea9
Author: Mike L <cl.jeremy@qq.com>
Date:   Wed Mar 13 12:03:54 2019 +0100

    Fix overdone fixes (inherit, :lang)

commit 62c9199159
Author: Mike L <cl.jeremy@qq.com>
Date:   Wed Mar 13 02:29:10 2019 +0100

    Fix elements w/ explicit lang (language chooser)

commit b3117587aa
Author: Mike L <cl.jeremy@qq.com>
Date:   Tue Mar 12 20:17:26 2019 +0100

    Fix textarea also (to match body)

commit 81cedf2c30
Author: Mike L <cl.jeremy@qq.com>
Date:   Tue Mar 12 19:41:39 2019 +0100

    Revert css temporarily to fix conflict

commit 80ff82797f
Author: Mike L <cl.jeremy@qq.com>
Date:   Tue Mar 12 19:15:30 2019 +0100

    Tweak CJK, fix Yu Gothic, more monospace inherits

commit 581dceb9a8
Author: Mike L <cl.jeremy@qq.com>
Date:   Mon Mar 11 13:09:26 2019 +0100

    Add Lato for latin extd. & cyrillic, improve CJK

* update stylesheet

* Code review UI improvements

* More fixes to dark theme

* Style fix

* Fix to allow add code review comments only on review files tab

* More readability dark style fixes

* Fix commenting on deleted files. Fixes #4752

* Fix line blame getting for multiple corner cases

* Initial ui components for pull request review

* Add Review
Add IssueComment types

Signed-off-by: Jonas Franz <info@jonasfranz.software>

(cherry picked from commit 2b4daab)
Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Replace ReviewComment with Content

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add load functions
Add ReviewID to findComments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add create review comment implementation
Add migration for review
Other small changes

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Simplified create and find functions for review

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Moved "Pending" to first position

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add GetCurrentReview to simplify fetching current review

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Preview for listing comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Move new comment form to its own file

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Implement Review form
Show Review comments on comment stream

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for single comments
Showing buttons in context

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add pending tag to pending review comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add unit tests for Review

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fetch all review ids at once
Add unit tests

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* gofmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Improved comment rendering in "Files" view by adding Comments to DiffLine

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for invalidating comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Switched back to code.gitea.io/git

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Moved review migration from v64 to v65

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Rebuild css

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* gofmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Improve translations

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix unit tests by updating fixtures and updating outdated test

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Comments will be shown at the right place now

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for deleting CodeComments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix problems caused by files in subdirectories

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for showing code comments of reviews in conversation

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for "Show/Hide outdated"

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update code.gitea.io/git

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for new webhooks

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update comparison

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Resolve conflicts

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Minor UI improvements

* update code.gitea.io/git

* Fix ui bug reported by @lunny causing wrong position of add button
Add functionality to "Cancel" button
Add scale effects to add button
Hide "Cancel" button for existing comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Prepare solving conflicts

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Show add button only if no comments already exist for the line

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add missing vendor files

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Check if reviewer is nil

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Show forms only to users who are logged in

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Revert "Show forms only to users who are logged in"

This reverts commit c083682

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Save patch in comment
Render patch for code comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add link to comment in code

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add reply form to comment list
Show forms only to signed in users

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add 'Reply' as translatable
Add CODE_COMMENT_LINES setting

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* gofmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix problems introduced by checking for singed in user

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add v70

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update generated stylesheet

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix preview
Beginn with new review comment patch system

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add new algo to generate diff for line range
Remove old algo used for cutting big diffs (it was very buggy)

* Add documentation and example for CutDiffAroundLine

* Fix example of CutDiffAroundLine

* Fix some comment UI rendering bugs

* Add code comment edit mode

* Send notifications / actions to users until review gets published
Fix diff generation bug
Fix wrong hashtag

* Fix vet errors

* Send notifications also for single comments

* Fix some notification bugs, fix link

* Fix: add comment icon is only shown on code lines

* Add lint comment

* Add unit tests for git diff

* Add more error messages

* Regenerated css

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* fmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Regenerated CSS with latest less version

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix test by updating comment type to new ID

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Introducing CodeComments as type for map[string]map[int64][]*Comment
Other minor code improvements

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix data-tab issues

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Remove unnecessary change

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* refactored checkForInvalidation

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Append comments instead of setting

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Use HeadRepo instead of BaseRepo

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update migration

Signed-off-by: Jonas Franz <info@jonasfranz.de>

* Regenerated CSS

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add copyright

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update index.css

Signed-off-by: Jonas Franz <info@jonasfranz.software>