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

Conflicts:
- app/models/media_attachment.rb
  Upstream added audio attachment support
- app/serializers/initial_state_serializer.rb
  Upstream added audio attachment support and how mimetypes are returned
- app/serializers/rest/instance_serializer.rb
  Upstream added a few fields
- config/application.rb
  Upstream added a different paperclip transcoder

app/controllers/settings/identity_proofs_controller.rb

@@ -61,8 +61,4 @@ class Settings::IdentityProofsController < Settings::BaseController
   def post_params
     params.require(:account_identity_proof).permit(:post_status, :status_text)
   end
-
-  def set_body_classes
-    @body_classes = ''
-  end
 end