Refactor: Rework continuous effect dependencies

Right now our system for continuous effects and dependencies isn't robust. There are two major aspects to this:

1. Properly determining which effects are dependent on others, which is currently only done on the gain ability layer (it's also important to check this on control-changing effects)
2. Handling dependencies once determined, especially dependency loops, which can be done via directed graphs. Our current implementation has issues with more complex dependency loops.

This is something I want to work on once we're done implementing AFR but I wanted to at least open this issue now.