Settings: dynamic PIE menu button + navbar menu logic cleanup (2/2)

at least the whole menu button stuff is from android version to android
version more depreciated and will go more and more away. So let us do it
like google:

- clean up the messy old AOKP navbar menu code
- make it only selectable when the menu button is really there
  and not as well when it is completly hidden
- remove the menu button action with big icon due off redundancy
- switch between modes: default jb (shows only on request), always and none
- All the above as well now in PIE...small button in first row is added
  same selectable modes for the menu lover lol
- smaller adjustments
- settings adjustments

Change-Id: Iab2f5bdcf59c6951ec12eafd4d0a3657a1620bd0

Conflicts:
	res/values/cm_strings.xml