Add quick emoji button next to text input

This allows for a user selectable button to be displayed next to the SMS text input area to allow quick access to the emoji icons. Seeing as how the current process to add an emoji requires going through the menu and then selecting the option, this allows for frequent users of emojis a much simpler and time saving method.

This modification is based heavily off the AOKP source introduced by 	Roman Birg.

Change-Id: I6fab11f155c5c112ed39785179093cecaa5500f6