Allow posting of just an emoji, move voting to a slash command
Currently when you post a comment that contains nothing but an Emoji, it doesn't post a comment but instead adds the Emoji as a vote/award. This can be confusing.
Now that we have slash commands, I think we should restore the old, more expected behavior, and move the voting/awarding to a slash command such as /award :emoji:
. The command should be a toggle, so there shouldn't be a /unaward
command.