Mms: themes section a complete cleanup.

ps1: move all themes settings strings to a constants java file.
ps2: cleanup smiley parser simplifing the color and hoping it holds.

ps3: add text size to all variables of the conversation list and message list views.
ps4: more cleanup
Signed-off-by: travp624 <travp624@gmail.com>
Mms: add quick smiley btn to bottom text entry bar.

ps. 1: create quick entry btn for emojis.
ps. 2: rebase adding a listview alertdialog for either insert smiley or insert emoji
ps. 3: create new drawable for button

Signed-off-by: travp624 <travp624@gmail.com>