XMPP provider:
* Add Unit Tests
* Add Functional Tests
* Send to rooms? I haven't tried that
* Register the user? Haven't tried that.

Slack Provider:
* Add more tests, remove Cpanel namespace deps from driver lib

IRC Provider:
* Make it actually work instead of being no-op on send, etc.
* Add tests

Other Providers:
* Discord
* Telegraph
* ... Whatever else is hanging out on the feature site that sounds interesting