Allow 20 max rows on message area.

Fix: Left test string in friends.

Fix: New members joining don't show.

# Conflicts:
#   src/components/common/LocaleSelector.tsx

Don't pass dispatcher in, just provide it globally.
Fix: Allow clicking through to profile from server sidebar.

- attachment scaling now works for all forms of attachments
- switched to grid based action bar
- added onLoad class so image proportions are "trimmed" once the image has loaded to avoid moving the view around before loading
  - this may be possible to remove at some point

replace js image scaling with css for message attatchments

See merge request revolt/revite!3

Can now collapse server categories.
Client remembers collapse state, incl. advanced appearance settings.

Remove Hardcore Mode.