* Remove unnecessary //noinspection ConstantConditions
* Add autocompletion for custom emoji
* Update MentionTagTokenizer tests for emoji autocomplete support
* Move 1) emoji list retrieval notifying and 2) setting of emojiList field into setEmojiList() method of ComposeActivity
* Convert RelativeLayout in item_autocomplete_emoji.xml to LinearLayout
* Rename MentionTag* to Compose*
* Improve emoji autocomplete matching
* Make hashtag autocomplete results bold
* Use Context.getString()'s built-in formatting
* Add a divider between emoji autocomplete results that *start with* the token and those that *contain* it
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