Panel view custom background (2/2)

Port from TeamBaked, use seperate thread, avoid future merge derp with CM source

-Reason I use panel view is cause setting this this way.
Sets both the notification shade and quick settings shade.

// Todo: possible fixes needed for tablets like nexus 10 etc.
// as the scaletype creates the pulldown to be bigger then it
// should be.

Signed-off-by: travp624 <travp624@gmail.com>
Add Seekbarpreference from CM