- Trigger the skill to execute when the mob receives a specific signal from the Signal mechanic.
- Useful for skills that require communication between mobs or from a
player to a mob [2].
- Note: Currently when a mob recieves a signal, it will only trigger one skill with the respective signal. To elaborate, if the mob has two skills like so: `- skill{s=SKILL1} ~onSignal:DO_THING``- skill{s=SKILL2} ~onSignal:DO_THING`, then only the first skill will trigger.
