Allow Super and Ultra Plastic nodes to be colored (#90)

Add `"colorable": true` to Super and Ultra Plastic nodes to enable unified dyes integration

nodes.json

@@ -14,12 +14,14 @@
     },
     "super_white": {
         "description": "Super Plastic",
+        "colorable": true,
         "light": 11,
         "sounds": "stone",
         "texture_name": "white2"
     },
     "ultra_white": {
         "description": "Ultra Plastic",
+        "colorable": true,
         "light": 14,
         "sounds": "stone",
         "texture_name": "white2"
@@ -122,7 +124,8 @@
         "description": "transparent metal floormesh",
         "texture_name": "mesh",
         "texture_modifier": "^[contrast:10:-50^[makealpha:0,0,0",
-        "drawtype": "glasslike"
+        "drawtype": "glasslike",
+        "sunlight_propagates": true
     },
     "pipe": {
         "description": "wall pipe"
@@ -322,4 +325,4 @@
         "description": "Black plate",
         "paramtype2": "none"
     }
-}
+}

nodes.lua

@@ -520,6 +520,7 @@ for name, def in pairs(nodes) do
 	local node_def = {
 		description = def.description,
 		drawtype = def.drawtype or "normal",
+		sunlight_propagates = def.sunlight_propagates,
 		tiles = tiles,
 		groups = {cracky=1, dig_generic = 3},
 		is_ground_content = false,