Mms: add new QuickReply buttons Delete & Mark Read

Allows customization of the QuickReply action in
the notification shade to respond to new incoming
sms messages. Enable through Mms > Settings

Patch Set 9:
  + enforce max of 3 QuickReply actions

Patch Set 10:
  + added new drawables Thanks Mr. Teague
  + fixed delete not marking thread as read

Change-Id: I55cae38e65f565af4e9edc86176e231ab043ff71