Mms: Option to delay SMS Sending

Add feature to delay SMS sending, user being able to cancel
SMS sending by touching the SMS, until set duration is elapsed.

Follow-up of http://review.cyanogenmod.org/#/c/36178/
    (and http://review.cyanogenmod.org/#/c/35231/) on cm-10.2 branch

Change-Id: I09dd045bde30c19c7552ee57d55a4a9434e98712

Conflicts:
	res/values-pt/slim_strings.xml
	res/values/cm_arrays.xml
	res/values/cm_plurals.xml
	src/com/android/mms/ui/MessagingPreferenceActivity.java
Fix NPE