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

Conflicts:
- .eslintrc.yml
  Removed, as upstream removed it.
- app/controllers/admin/statuses_controller.rb
  Minor code cleanup when porting one of our features.
- app/models/account.rb
  Note length validation has changed upstream.
  We now use upstream's validation (dropped legacy glitch-soc
  account metadata stuff) but with configurable limit.
- app/services/post_status_service.rb
  Upstream has added support for scheduled toots, refactoring
  the code a bit. Adapted our changes to this refactoring.
- app/views/stream_entries/_detailed_status.html.haml
  Not a real conflict, changes too close.
- app/views/stream_entries/_simple_status.html.haml
  Not a real conflict, changes too close.

spec/models/account_warning_preset_spec.rb

@@ -1,5 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe AccountWarningPreset, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
-end

spec/models/account_warning_spec.rb

@@ -1,5 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe AccountWarning, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
-end

spec/models/scheduled_status_spec.rb

@@ -0,0 +1,4 @@
+require 'rails_helper'
+
+RSpec.describe ScheduledStatus, type: :model do
+end