Add a quick SELinux mode toggle

There's no way to make it persistent, by design. This is purposefully
undocumented and meant to test policies at this stage.

Change-Id: Ic79ed773b199b68fee15f94acd2107a5ad20dc25
Signed-off-by: scotthartbti <scott@ubuntu.com>

Conflicts:
	src/com/android/settings/DeviceInfoSettings.java
Fix ups from 4.3 merge
Signed-off-by: scott <scott@ubuntu.com>

Change-Id: I63d2737222696652ae3bf3bc50be7011735f3048
Revert "disable not supported features on third party ime keyboards 2/2"

This reverts commit 8d6ba79cd20e17f94d64a75b0ff3e8a2400f5bea.