Moved the base windows classes to their own module
Moved XBMC constants to their own module
Fixed skin error with Video skin for missing default avatar file
Moved some of the Video skins lists into groups to get rid of the
"Control BLAH in window BLAH has been asked to focus, but it can't" log
messages
In Video skin, made back/edit close the slide out menu (if open) to
match rest of skin behavior
Logged in indicator now refresh when returning to a window