xbmc (Gotham) fully disable Minimize()

this doesn't play well with our WM. in both standalone/non-standalone mode
ratpoison: bind alt-tab
ratpoison: rename ratpoison.service to windowmanager.service
ratpoison: disable xft
new package: 'dwm'

TESTING. a ratpoison replacement. set WINDOWMANAGER="dwm" to test it
dwm: ups. clean up leftover. xinerama and xft not really needed