Switch to TG hair sprites.

This removes the need for a separate shader because they're multiply-based instead of additive like /vg/ or Bay.

Resources/Prototypes/Shaders/hair.yml

@@ -1,6 +0,0 @@
-- type: shader
-  id: hair
-  kind: source
-  path: "/Shaders/hair.swsl"
-  params:
-    hairColor: "#000000"