settings.cyanogenmod: Added option to always pull down quick settings

Added options, and new summary to always pull down quick settings,
except when there are no notifications.

Change-Id: I51043161d5c8838e266cdcced7d60b87ec926da7
Add intent-filter for Performance Settings

Change-Id: I5ab0d291c598eb021c6bcfc293d15bd7af8ae4e2