Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `app/services/remove_status_service.rb`:
  Conflict caused by us having a distinc Direct timeline.
  Ported upstream changes.
- `app/javascript/mastodon/features/compose/components/compose_form.js`:
  Conflict between glitch-soc's variable character limit and upstream
  refactoring that part of the code.
  Ported upstream changes.

Gemfile.lock

@@ -375,6 +375,9 @@ GEM
       addressable (~> 2.3)
       nokogiri (~> 1.5)
       omniauth (~> 1.2)
+    omniauth-rails_csrf_protection (0.1.2)
+      actionpack (>= 4.2)
+      omniauth (>= 1.3.1)
     omniauth-saml (1.10.3)
       omniauth (~> 1.3, >= 1.3.2)
       ruby-saml (~> 1.9)
@@ -742,6 +745,7 @@ DEPENDENCIES
   oj (~> 3.10)
   omniauth (~> 1.9)
   omniauth-cas (~> 2.0)
+  omniauth-rails_csrf_protection (~> 0.1)
   omniauth-saml (~> 1.10)
   ox (~> 2.13)
   paperclip (~> 6.0)