#130 | Remove global theme settings
#131 | Make only one theme "active" at a time
#327 | Rework theme settings to use CMI
#301 | Remove the "ok" css class
#xx | Update all preprocess docblocks "Prepares variables for html.tpl.php"
backdrop/backdrop#309 | Remove region specific template suggestions for blocks d.o

Related Github Issues: 
https://github.com/backdrop/backdrop-issues/issues/196