Settings: Less Notification Sounds (2/2)

Ported 'Bluewall Firewall' from AOKP

mutes notification sounds for an application for <X> seconds after playing

Patchset 2: rebase
Patchset 3: minor fixes based on suggestions from Jeff and Lars

Change-Id: I8d2e244a56f7a2e6bcefcfd95d8efb47592ccf0d

Conflicts:
	res/values/cm_arrays.xml
	res/values/cm_strings.xml