Add checkbox to include original text or not.

Added the "Include text" checkbox according to the latest mock.

Before:
- We removed original message when the user pressed X.

Now:
- We save the original message all the way till the draft is sent.
- The "Include text" check state is saved in the db.  (to Message.mFlags)

Bug 3072414

Change-Id: Ie7bcca23bb6a02d676700027b0b6cb94b6627236
1 file changed