* 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 repo type option to /api/repo/search

* Add tests and fix result of collaborative filter in specific condition

* Fix/optimize search & tests

* Improve integration tests

* Fix lint errors

* Fix unit tests

* Change and improve internal implementation of repo search

* Use NonexistentID

* Make search api more general

* Change mirror and fork search behaviour

* Fix tests & typo in comment

* Fix and remove FIXME

* Respect membership visibility

* Fix/rewrite searchRepositoryByName function

* Add unit tests

* Add integration tests

* Remove Searcher completely

* Remove trailing space

* Add more repo search tests

* Add and fix /api/repo/search integration tests

* Add owner to access table for organization repositories

* Remove tests

* Remove unit types commits and settings

* Can not limit units in administrator teams

* Limit changing units only to teams with read and write access mode

* Small code optimization