Figure out what to do about Animation.types()

[doughsay]

Need to have a discussion about this, a lot of us feel like something's wrong here...

[vanvoljg]

Maybe an ETS table that holds onto this part of application state? Meaning the animations which are available to the application.

I'm still puzzling out how to do discovery of available modules and how to turn that into a type. I really want to figure out how to do it at runtime, but it may end up being compile-time. Runtime would make it so we evenually can allow users to add their own animations to a running Xebow application, which would be fantastic.