Add nickserv GHOST auto-response (untested).
Add some TODOs.
Build incremented: 0.0.20 => 0.0.21.
Add submodule to centralize random pickings.
Add a submodule to centralize strings.

Only used currently for "witty" strings right now. More or less
contrived. Could eventually contain all strings.

Single language for now, but it wouldn't be hard to support many
languages.
Add lyrics file to MANIFEST.
Build incremented: 0.0.21 => 0.0.22.