* Add support for sending user emoji using autocomplete
What's included:
- An implementation for detecting user emojis
- Addition of user emojis to the emoji autocomplete in the command bar
- Translation of shortcodes into image tags on message sending
What's not included:
- Loading emojis from the active room, loading the user's global emoji packs, loading emoji from spaces
- Selecting custom emoji using the emoji picker
This is a predominantly proof-of-concept change, and everything here may be subject to
architectural review and reworking.
* Amending PR: Allow sending multiple of the same emoji
* Amending PR: Add support for emojis in edited messages
* Amend PR: Apply requested revisions
This commit consists of several small changes, including:
- Fix crash when the user doesn't have the im.ponies.user_emotes account data entry
- Add mx-data-emoticon attribute to command bar emoji
- Rewrite alt text in the command bar interface
- Remove "vertical-align" attribute from sent emoji
* Amending PR: Fix bugs (listed below)
- Fix bug where sending emoji w/ markdown off resulted in a crash
- Fix bug where alt text in the command bar was wrong
* Amending PR: Add support for replacement of twemoji shortcodes
* Amending PR: Fix & refactor getAllEmoji -> getShortcodeToEmoji
* Amending PR: Fix bug: Sending two of the same emoji corrupts message
* Amending PR: Stylistic fixes
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