Commands:

:r -- register via Register(email)

:u -- change username via UserUpdate

Features:

* remove JSON config

* read $home/lib/discord.face for profile picture (or just face?)

* if ``` entered, allow multi-line message (composition)

* replace <:emoji:3lk4j12:> garbage with :emoji:

* clean up @'s

* replace libnotify shenanigans, add a goroutine to check for pings