* add conflict detection

* test pull request conflict files

* fix detection files number

* fix comments

* Don't display buttons if there are no notices

* clear stopwatch on merging a PR

* remove redundant gt check

* use ctx.Flash as per @bkcsoft comment

* stop timer on closing issues/PRs too

* updated translation as per review

* redirect to login page after successfully activating account

* remove unrelated changes

* stop timer for issues that are closed via commits too..Not just the 'close' UI button

1. A key can either be an ssh user key or a deploy key. It cannot be both.
2. If a key is a user key - it can only be associated with one user.
3. If a key is a deploy key - it can be used in multiple repositories and the permissions it has on those repositories can be different.
4. If a repository is deleted, its deploy keys must be deleted too.

We currently don't enforce any of this and multiple repositories access with different permissions doesn't work at all. This PR enforces the following constraints:

- [x] You should not be able to add the same user key as another user
- [x] You should not be able to add a ssh user key which is being used as a deploy key
- [x] You should not be able to add a ssh deploy key which is being used as a user key
- [x] If you add an ssh deploy key to another repository you should be able to use it in different modes without losing the ability to use it in the other mode.
- [x] If you delete a repository you must delete all its deploy keys.

Fix #1357

As per @lafriks comment this should be: requested changes

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

* remame reject to 'request changes

* make usee of requested changes in issue's view content

* add util method and tests

* make sure the title of an issue cannot be empty

* wiki title cannot be empty

* pull request title cannot be empty

* update to make use of the new util methof

Previous Gitea would display that the user had unassigned themselves even if the actor
was not the user. Fixes #4418

* Refactor repo.isBare to repo.isEmpty #5629

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

* Remove Sync call

* add discord auth

* add vendor for discord

* fix syntax error

* make fmt

* update version of goth in use

* update markbates/goth

* add migration and basic UI for changing a user's theme

* update user themem

* use right text on button

* load theme based on users' selection

* load theme based on users' selection in pwa too

* update sample config

* delete older theme loading

* implement AfterLoad to set users' theme properly

* set up default theme when creating a user. This uses the installation wide theme

* use flash messages for error

* set default theme when creating a user from the cli

* fix @lunny review

Signed-off-by: Julian Tölle <julian.toelle97@gmail.com>