Mms: added the option to change the soft keyboard type when composing messages

This commit gives the user the option to change the keyboard from Emoji
to enter for a new line or enter to send.
The setting has no effect on the hardware keyboard.

Ported from http://gerrit.sudoservers.com/#/c/3859/ , fixed whitespaces

Change-Id: I9bd661dac747652ad01e3b002aa294f691b87a37