
TODO:
- add more methods for playing sounds
- rename sounds (e.g. "place_metal" to "metal_place"
- normalize sound files
- document node sound groups
- add more sounds:
	- hit/damage
	- tool breaks
	- lava cool
	- chicken
	- zombie
	- bee
	- rat / mouse
	- wind
	- tree
	- leaves
	- duck
	- bat
	- camel
	- monkey / chimp
	- dolphin
	- goat
	- bear
	- leopard
	- lion
	- tiger
	- lamb
	- parrot
	- penguin
	- pig
	- puppy
	- squirrel
	- toucan
	- wolf
	- coyote
	- airplane
	- car
	- motorcycle
	- bicycle
	- clock
	- fire
	- grasshopper
	- cricket
	- raccoon
	- train
	- rain
	- ticking bomb
	- zipper
	- jaguar
	- gorilla
	- owl
	- vulture
	- whale
	- zebra
	- piano
	- whistle
	- inflate
	- pop
	- gas motor / generator
	- chalk
	- horn
	- creak
	- door open
	- door close
	- door slam
- add sounds from:
	- cmer
	- slingshot
