Hideous reflection for QSL compatibility

[unilock]

This PR commits crimes against the JVM to implement compatibility with Quilt Standard Library's StatusEffectEvents.
This prevents a crash when QSL's LivingEntityMixin is applied before Spectrum's LivingEntityPreventStatusClearMixin, and fixes the latter not actually doing anything when the inverse is true.

We can't simply modCompileOnly QSL, since it refuses to remap under Fabric Loom. I guess it needs Quilt Mappings specifically? Whatever, this won't matter outside of 1.20.1 anyway.

TODO:

• [ ] Testing.