* Restricted users (#4334): initial implementation

* Add User.IsRestricted & UI to edit it

* Pass user object instead of user id to places where IsRestricted flag matters

* Restricted users: maintain access rows for all referenced repos (incl public)

* Take logged in user & IsRestricted flag into account in org/repo listings, searches and accesses

* Add basic repo access tests for restricted users

Signed-off-by: Manush Dodunekov <manush@stendahls.se>

* Mention restricted users in the faq

Signed-off-by: Manush Dodunekov <manush@stendahls.se>

* Revert unnecessary change `.isUserPartOfOrg` -> `.IsUserPartOfOrg`

Signed-off-by: Manush Dodunekov <manush@stendahls.se>

* Remove unnecessary `org.IsOrganization()` call

Signed-off-by: Manush Dodunekov <manush@stendahls.se>

* Revert to an `int64` keyed `accessMap`

* Add type `userAccess`
* Add convenience func updateUserAccess()
* Turn accessMap into a `map[int64]userAccess`

Signed-off-by: Manush Dodunekov <manush@stendahls.se>

* or even better: `map[int64]*userAccess`

* updateUserAccess(): use tighter syntax as suggested by lafriks

* even tighter

* Avoid extra loop

* Don't disclose limited orgs to unauthenticated users

* Don't assume block only applies to orgs

* Use an array of `VisibleType` for filtering

* fix yet another thinko

* Ok - no need for u

* Revert "Ok - no need for u"

This reverts commit 5c3e886aab.

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

* Add Backend Logic for Toggling Email Notification

This commit adds the backend logic for
allowing users to enable or disable email
notifications. The implementation ensures
that only issue notification emails get disabled
and important emails are still sent regardless
of the setting.

The UI to toggle this setting has not yet been
implemented.

* Add UI and complete user email notification enable

This commit completes the functionality to allow
users to disable their own email notifications.

Signed-off-by: Gary Kim <gary@garykim.dev>

* Add Third Option for Only Email on Mention

Signed-off-by: Gary Kim <gary@garykim.dev>

* Readd NOT NULL to new preference string

Signed-off-by: Gary Kim <gary@garykim.dev>

* Add Tests and Rewrite Comment

Signed-off-by: Gary Kim <gary@garykim.dev>

* Allow admin to set default email frequency

Signed-off-by: Gary Kim <gary@garykim.dev>

* Add new config option to docs

Signed-off-by: Gary Kim <gary@garykim.dev>

* Fix a few mistakes

Signed-off-by: Gary Kim <gary@garykim.dev>

* Only update required columns

Signed-off-by: Gary Kim <gary@garykim.dev>

* Simplify an error check

Signed-off-by: Gary Kim <gary@garykim.dev>

* Make email_notification_preference column in DB be VARCHAR(20)

Signed-off-by: Gary Kim <gary@garykim.dev>

* Handle errors

Signed-off-by: Gary Kim <gary@garykim.dev>

* Update models/migrations/v93.go

Co-Authored-By: Lauris BH <lauris@nix.lv>

* 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