Add pagination and search to users

See merge request pleroma/pleroma!873

Use sql query in User.get_follow_requests/1 for filtering logic

See merge request pleroma/pleroma!883

Atomic update for note count and follower count

See merge request pleroma/pleroma!885

Increment user note count only on public activities #703

See merge request pleroma/pleroma!884

Remove follow_request_count as it's not needed for FE anymore.

See merge request pleroma/pleroma!886

MastoFE uses `GET /api/v1/follow_requests` and PleromaFE uses
`GET /api/pleroma/friend_requests` which they query on the initial page
load.

[#675] Do not show DMs in mentions timeline

See merge request pleroma/pleroma!877

Bugfix: OAuth scopes formatting

Closes #702

See merge request pleroma/pleroma!881

activitypub: fix date header format

See merge request !879

HTTP date header specification says that days must always be two-digit.
Accordingly, change the format string used to ensure days are always
represented as two-digit (e.g. 01).

Migration for adding tags to the existing users records

See merge request !878

Bugfix #236 Prefer user look-up by nickname

See merge request !860

upgrade to cowboy 2.6

See merge request !876