[WIP] basic smoke trail a go-go
adjusted Dash and climb smoke offsets and frequencies
Added the placeholder dash sparks decoration
[WIP] z order sorting for world registered entities
Sorted all entities by ZOrder
Drawables list now cleans up after itself
Merge branch 'master' into tertiary_entities
Merge branch 'tertiary_entities' into bullet_collision

Conflicts:
	bullet_factory.lua
	entity.lua
	player.lua