Trebuchet: Additional options

PS1:
* Gestures
* Icons scale
* Drawer background wallpaper

PS2:
* Added ability to choose a customized color for drawer bg

PS3:
* Fixup build and remove merge errors

Change-Id: I3c839995f18f6689ef961a8b9ed078a25562f4da

Owner Giovanni Rocca (pac-rom)
Sorry I lost the commit message..