User, Webfinger: Remove OStatus vestiges

Closes #1737

See merge request pleroma/pleroma!2471

Ignore unexpected query params and ENUM values

Closes #1719

See merge request pleroma/pleroma!2468

Only update follower/following stats for actor types of users and bots.

Closes #1565 and #1729

See merge request pleroma/pleroma!2464

It's used for remote following.

Mainly the `magic_key` field

Fix inconsistency in language for activating settings in description.exs

Closes admin-fe#108

See merge request pleroma/pleroma!2469

Like activities: Move fixes to validator.

See merge request pleroma/pleroma!2467

Feature/1710 consolidate instance info

Closes #1710

See merge request !2430

Mastodon API: do not create a following relationship if the corresponding follow request doesn't exist when calling `POST /api/v1/follow_requests/:id/authorize`

Prevents the possibility of re-registration, which allowed to read
DMs of the deleted account.

Also includes a migration that tries to find any already deleted
accounts and insert skeletons for them.

Closes pleroma/pleroma#1687

[FIX] [#1732] Made AP C2S :followers and :following endpoints serve on no auth

Closes #1732

See merge request pleroma/pleroma!2463

(as for related :api pipeline endpoints).

Follow request notifications enforcement

See merge request pleroma/pleroma!2451

PleromaFE bundle supporting follow request notifications

See merge request pleroma/pleroma!2462

pleroma-fe@5f90b6a3

static-fe.css: Restore and move to /priv/static/static-fe

See merge request pleroma/pleroma!2458

Fix sporadic test compilation failure caused by unused alias

See merge request pleroma/pleroma!2460