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

PS6 : Rebase

Change-Id: I09dd045bde30c19c7552ee57d55a4a9434e98712

Conflicts:

	src/com/android/mms/ui/MessageListItem.java