OmniGears: AD brightness - do your math homework max :)

http://jira.omnirom.org/browse/OMNI-752

Change-Id: Ibb123378c47a6e4c337740c95d5eb4eead4cd4b5
merge changes from Omni 4.4 into local branch
[2/2] OmniGears: On-The-Go mode

On-The-Go turns on the camera of your phone and streams it to an overlay,
which is drawn over everything.
this makes you feel like your display is transparent, as you see the content
behind it.

its really useful when you are using your phone while walking, thats why
we called it "On-The-Go"

allows to change transparency of the overlay via the notification.

have fun!

also cleanup menu settings

Change-Id: I1d6b538f9474f01cbe093d33983e8278fc44c1e8

Conflicts:
	res/xml/menus_settings.xml
	src/org/omnirom/omnigears/interfacesettings/MenusSettings.java