Fix PM compose and done buttons.

Done button wasn't tappable in edit mode.

The compose button no longer has a border, and smoothly disappears while
editing.
Don't try to upload nonexistent images.
Forums list shows edit button only when favorites present.
Fix compose view hiding text under keyboard.
Update awful://favorites for no more Favorites tab.
PM view shows loading screen, doesn't re-download.
Fix crash on first launch.
Add/remove Leper's Colony section on log in/out.
Hide popover after selecting Leper's Colony entry.