Makes acid levels a component.
Merges the acid effect object into the component.
Reworks acids decay rates slightly.
Rebalances xenos acid spit so that they can still melt through walls.
Misc. associated changes:
Adds defines for a lot of the acid associated constants.
Documents clean types and adds CLEAN_TYPE_ACID
Adds and implements a return bitflag for COMSIG_COMPONENT_CLEAN_ACT
Adds a looping sound for acid.
Makes /atom/proc/acid_act return a boolean.
Fixes waterclosets creating a new reagent holder datum every time they are used.
Removes waterclosets regenerating reagents on-use and restricts their reaction volume to 5 units.
Adds and implements a couple reagent signals.
Renames a few vars so Rohesie can stop telling me to rename more vars.
Co-authored-by: TemporalOroboros <TemporalOroboros@gmail.com>
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