Removes deprecated stylesheets.
Adds trash/untrash buttons and routes to match

Also auto-updates the Favorites counters in the project list each time
an item is favorited and unfavorited. The favorite and unfavorite
actions return json of action => "set" or "unset" depending on whether
or not it was favorited or unfavorited (a pattern that will be reused)
and the client accordingly removes the item from the item list if they
happen to be viewing the Favorites list at the time.