Add Holo dark icons

Preperation for alternate Holo Dark theme
Define menu icons based on current theme
Rename default theme to Theme.Light

Change-Id: I4de52cd30b71ef03161f48f6eb6d45df52326005
Add alternate dark colors

Remove some unused styles and colors

Change-Id: Ic944c13cee36cfde821eb9f2a300c4839616360f