Expose heads up, (2/2):

Thanks to CyanogenMod:
https://github.com/CyanogenMod/android_packages_apps_Settings/commit/7c323bcbcd2f48a19c556db8afb3a46b99e35515
https://github.com/CyanogenMod/android_packages_apps_Settings/commit/ca559b9ff57c85295d23a3d3de49dc81b6a45911
https://github.com/CyanogenMod/android_packages_apps_Settings/commit/3bc3238c32dfdb3c1903da098659704168346a66
https://github.com/CyanogenMod/android_packages_apps_Settings/commit/8ea05ccb10bc57a3d50a915bcc636ac7f1fa5dc9

Included:
- Enable/disable heads up
- Do not disturb
- Blacklist