* Add ActivityPub inbox

* Handle ActivityPub deletes

* Handle ActivityPub creates

* Handle ActivityPub announces

* Stubs for handling all activities that need to be handled

* Add ActivityPub actor resolving

* Handle conversation URI passing in ActivityPub

* Handle content language in ActivityPub

* Send accept header when fetching actor, handle JSON parse errors

* Test for ActivityPub::FetchRemoteAccountService

* Handle public key and icon/image when embedded/as array/as resolvable URI

* Implement ActivityPub::FetchRemoteStatusService

* Add stubs for more interactions

* Undo activities implemented

* Handle out of order activities

* Hook up ActivityPub to ResolveRemoteAccountService, handle
Update Account activities

* Add fragment IDs to all transient activity serializers

* Add tests and fixes

* Add stubs for missing tests

* Add more tests

* Add more tests

Resolve #3199

apply same style class to the About description on both the landing page
and the about/more page

* Revert "Adjust tags and accounts page (#4534)"

This reverts commit a3e53bd4.

* Revert "feat: Cache status height to avoid expensive renders (#4439)"

This reverts commit 8eb6d171.

* Revert "Refactor Avatar and AvatarOverlay to have 'account' as prop instead of src and staticSrc (#4526)"

This reverts commit 59423474.

* Revert "Update dependencies for Ruby (#4543)"

This reverts commit 22db9472.

* Revert "[Docker] Add multicore support to "make" and "bundler" (#4544)"

This reverts commit 5d408fd9.

* Revert "It makes no sense to try using invalid or expired link again (#4521)"

This reverts commit 47579ec5.

* Revert "i18n: Update Polish translation (#4545)"

This reverts commit 3363a055.

* Revert "Set false to animated options for thumbnail processor (#4547)"

This reverts commit 87f10d47.

* Adjust tag and accounts page

* Remove units from 0px paddings

* feat: Cache status height to avoid expensive renders

* feat: Escape content and emojify in reducers

* fix(css): Remove backface-visibility: hidden from .scrollable

* fix(statuses): Avoid creating DOMParses inside a loop

* Refactored Avatar and AvatarOverlay (DRY) to have 'account' as prop.
Also removed animate attribute from compose navigation bar, which should
have never been there. Added test for avatar overlay.

* fix broken tests

* god dammit another bug in tests! travis please let this pass

* formatting in avatar overlay

Resolve #3199

Fix the aspect ratio of animated GIF whose background is transparent.

The feature to pin column could hide the rightmost column, which is
specified with children property of ColumnsArea.

The user is likely to see the column when the property changed, so scroll
the area in such cases.

fix style

"©"削除処理をemojione_lightに移動

Fixes #4496

Use `text-align: unset` instead of `text-align: start` which Edge doesn't support for now.

Also remove default margin on Safari.

Previous and Next buttons

* fix(web_push_notifications): Send grouping title in welcome notification

* fix(web_push_notifications): Read message from last notification

* Re-add outline

* respect default of web browser

* i18n: update Persian translation

* i18n: fix quotes

URI.extract is too strong, not limited to URLs, matched real text.
Same issue was present in language detector.

* fix(media_modal): Keyboard navigation

* fix(column_back_button): Use native button

* fix(media_gallery): Keyboard navigation

* fix(status_content): Make CW content focusable

* Remove outline from focused toot

* change style

Empty a element is created when there is no business e-mail input.