Jake McGinty bf133c65c3 refactor emoji code into package
1) EmojiTextView and EmojiEditText are used instead of
   using code to emojify text.

2) Emoji categories' code points are specified in XML

3) EmojiDrawer itself is a fragment, and its pages are
   also fragments, allowing for better memory
   management.

Fixes #2938
Fixes #2936
Closes #3153

// FREEBIE
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