emojicons

After all that freaking work, I discover a library exists already for the iOS emoji pack. Apache 2.0 license (https://github.com/rockerhieu/emojicon/blob/master/LICENSE).

At the very least, a start. Also removed preference to set smiley to enter key (will always be enter key) since there's now a persistent emoji toggle.
Likewise, it seems like most of this should be elsewhere if possible.