* Use Mastodon server-side settings for automatically expanding toots with CWs
* Add modal warning about settings changes
* Use Mastodon server-side settings for disabling swiping
Also lay some groundwork needed to interactively change the
glitchfriend.
The codebase uses "elefriend" because it's shorter and didn't require me
to realign the actions in actions/compose.js. Same idea, though.