Make character limit configurable (from tootsuite/mastodon#5697)

Merge upstream (tootsuite/mastodon#5703)

Follow and FollowRequest had conflicts in their schema annotations, so I
ran latest migrations and let annotate_models fix them up.

* Add structure for lists

* Add list timeline streaming API

* Add list APIs, bind list-account relation to follow relation

* Add API for adding/removing accounts from lists

* Add pagination to lists API

* Add pagination to list accounts API

* Adjust scopes for new APIs

- Creating and modifying lists merely requires "write" scope
- Fetching information about lists merely requires "read" scope

* Add test for wrong user context on list timeline

* Clean up tests

Merge upstream (e28b33c.. 94c5a11)

Update StatusPolicy to check current_account for local_only? toots.

Themed preloading

To comply WCAG 2.0 guidelines on contrast ratio.

StatusPolicy#account was renamed to StatusPolicy#current_account in
upstream.  This commit renames the local-only changes to match and
augments the #show? policy spec with what we expect for local-only
toots.

Consistency, eslint, etc.

Remove 'spin' theme

This gets wide view, auto layout, and navbar-under-mobile working again.

* Scrub text of html before detecting language.

* Detect language on statuses coming from activitypub.

* Fix rubocop comments.

* Remove custom emoji from text before language detection

Merge upstream at commit 3023725

Allow streaming server to take bindhost from HOST env

Allow hiding reblogs on a per-follow basis

Apparently I missed some things in earlier commits/releases that needed to be applied to the Nanobox setup. All minor things, nothing that breaks anything, but still best to get them in place.

- Move cron jobs to their own component, so the Sidekiq component can be scaled up to multiple instances without causing issues with running the same cron job multiple times at once.
- Update cron jobs to the latest requirements, removing extraneous ones
- Add new variables to `.env.nanobox`
- Update Nginx to use correct cache header directives