This PR refactors firestacks into two status effects: fire_stacks, which behave like normal firestacks you have right now, and wet_stacks, which are your negative fire stacks right now. This allows for custom fires with custom behaviors and icons to be made.
Some fire related is moved away from species(what the fuck was it even doing there) into these as well.
Oh and I fixed the bug where monkeys on fire had a human fire overlay, why wasn't this fixed already, it's like ancient.
Also changed some related proc names to be snake_case like everything should be.
This allows for custom fire types with custom behaviours, like freezing freon fire or radioactive tritium fire. Removing vars from living and moving them to status effects for modularity is also good.
Nothing to argue about since there's nothing player-facing
Loosely adapted from /vg/. This is an entity component system for adding behaviours to datums when inheritance doesn't quite cut it. By using signals and events instead of direct inheritance, you can inject behaviours without hacky overloads. It requires a different method of thinking, but is not hard to use correctly. If a behaviour can have application across more than one thing. Make it generic, make it a component. Atom/mob/obj event? Give it a signal, and forward it's arguments with a SendSignal() call. Now every component that want's to can also know about this happening.
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