Rework Ability API

[itsaphel]

As I thought, I'd have to rework how abilities work.

They should be linked in with a phase directly, so their registration is better handled (e.g. by @GameEvent).

It works fine right now, but ideally rework it to be better integrated with the phase setup.

[itsaphel]

https://hastebin.com/iritewisep.coffeescript