Mms: Move CAF strings

Change-Id: I0e92dbd6b68eae21648fb700c130cdf49b045b06
Mms: Add native heads up support

Add heads up support (optional but enabled by default).

Shows important messages of this app as heads up.

Means:
- All MMS
- SMS if quickpopup is disabled

Other messages like storage or blacklist notifications are not important and will not show as heads up

PS:
- show always as expanded.....so user can directly interact with it

Change-Id: Id83633610c18ab4e380bfb910ea50e8bf7b61be6

Conflicts:
	res/values/slim_strings.xml
	res/xml/preferences.xml
	src/com/android/mms/ui/MessagingPreferenceActivity.java
Mms: Remove unused strings

Change-Id: I0f361a572e2ed1adde38d74ce9766ecee30160bd
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0