introduce awesome checkbox preferences

they autohandle themselves as good as possible:
*) they automatically write to single files or multiple files at once
*) they automatically check themselves, depending on the value of the file
they write to
*) they automatically set bootup restoration if wanted

use AwesomeCheckBoxPreference where possible

Change-Id: I29f3cf14e949bf2b434db4a95fe6c82f16e77fe2