SystemUI: disable notifications for non-system apps via notification longpress

Change-Id: I9855d82f7f11e65f23f0b890efc7f58fae0291f9
[1/2] Toast animations

Change-Id: Ia50714528cdc844ec9f9737341432f73a15cb82b
[1/2] Disable screenshot sound option

Change-Id: I59f3c5bdc3697e5e5e3517d460099627277f2eac