We no longer use libera as they were found to be spying on their
users' private conversations, so we've replaced it with a
public tox group via the new groupchat implementation
- Give window tab and statusbar a make over
- Place window tab above input field
- Reduce input field to one square in height
- Refactor window tab so that it's now a subwin of its parent ToxWindow
- Fix bug causing notification counter to sometimes increment by 2
- No longer scroll on output when output is not at bottom of screen
- Show a small indicator on far left of window tab when output is
not at bottom of screen
- Reduce ncurses/UI thread sleep time by half
- Handle nanosleep errors better
