Settings: Make CM Settings visible for users other than the owner

Patchset 2: Remove themes
Patchset 3: Re-add themes to test if they are independent
Patchset 4: Remove themes again.
Patchset 5: Rebase and add Privacy Guard
Patchset 6: Add Buttons

Change-Id: Ia22c9b244d924e6bb3c89dbd059df53d6a888ac6
Merge "Settings: Make CM Settings visible for users other than the owner" into cm-11.0