Draw world sprites from sprites

Property definitions

gamnit :: flat_core $ App :: frame_core_world_sprites
	# Draw world sprites from `sprites`
	protected fun frame_core_world_sprites(display: GamnitDisplay)
	do
		frame_core_sprites(display, sprites, world_camera)
	end
lib/gamnit/flat/flat_core.nit:551,2--555,4