Draw UI sprites from ui_sprites

Property definitions

gamnit :: flat_core $ App :: frame_core_ui_sprites
	# Draw UI sprites from `ui_sprites`
	protected fun frame_core_ui_sprites(display: GamnitDisplay)
	do
		# Reset only the depth buffer
		glClear gl_DEPTH_BUFFER_BIT

		frame_core_sprites(display, ui_sprites, ui_camera)
	end
lib/gamnit/flat/flat_core.nit:557,2--564,4