Add summary to notification filtering

Change-Id: Ie02165f72e67b2fc6aa086de61303a53a7ee4470
Heads up: enable heads up notification checkbox for all

- Disbale check of system packages to allow checkbox for all. This will, for example, bring screenshot to heads up if SystemUI is enabled

Change-Id: I273caffa992e79a9a9d6914bf1c89f9388044da4
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Settings into android-4.4