SystemUi: Navigation bar Quick launch shortcuts (2 of 2)

This allows up to 3 targets on the Navigation bar ring
or Home buttons with custom Quick launch shortcut actions.

Patchset 1 - 21 - Initial commits and edits
Patchset 22 - Update commit message

Change-Id: Ic5bc6021d55b9c266527463bb916283feb00ad06
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_frameworks_base into cm-10.1