Refactor head mod and add skeleton heads

mods/head/init.lua

@@ -1,6 +1,6 @@
 -- head system
 
-function addhead(node, desc)
+local function addhead(node, desc)
 	minetest.register_node("head:"..node, {
 		description = ""..desc,
     		drawtype = "nodebox",
@@ -11,14 +11,14 @@ function addhead(node, desc)
 				{ -0.25, -0.5, -0.25, 0.25, 0.0, 0.25, },   			
 			},
 		},
-			groups = {snappy=1,choppy=2,oddly_breakable_by_hand=2,head=1},
+		groups = {oddly_breakable_by_hand=3, head=1},
 		tiles = {
-				node.."_top.png",
-				node.."_top.png",
-				node.."_left.png",
-				node.."_right.png",
-				node.."_back.png",
-				node.."_face.png",
+			"head_"..node.."_top.png",
+			"head_"..node.."_top.png",
+			"head_"..node.."_left.png",
+			"head_"..node.."_right.png",
+			"head_"..node.."_back.png",
+			"head_"..node.."_face.png",
 		},	    
 		paramtype = "light",
 		stack_max = 16,
@@ -29,7 +29,9 @@ function addhead(node, desc)
 			type = "fixed",
 			fixed = { -0.25, -0.5, -0.25, 0.25, 0.0, 0.25, },
 		},
-			
+		sounds = default.node_sound_defaults({
+			footstep = {name="default_hard_footstep", gain=0.3}
+		}),
 	})
 end
 
@@ -37,3 +39,5 @@ end
 addhead("zombie", "Zombie Head")
 addhead("creeper", "Creeper Head")
 addhead("steve", "Steve Head")
+addhead("skeleton", "Skeleton Skull")
+addhead("wither_skeleton", "Wither Skeleton Skull")