This PR is way less than the file changes make it seem like it is.
Okay, first, the boring part:
- Picking up burning items is now a signal registered on the burning
component itself, instead of being a direct /obj/item/attack_hand()
check
- Sear sound now has an SFX define for convenience, since it is very
commonly used
- Fire stacks when extinguished on mobs will no longer clean acid on
items (WTF?)