Add hardware node coloring. Includes:

- Increase ContentFeatures serialization version
- Color property and palettes for nodes
- paramtype2 = "color", "colored facedir" or "colored wallmounted"

src/script/cpp_api/s_node.cpp

@@ -59,6 +59,9 @@ struct EnumString ScriptApiNode::es_ContentParamType2[] =
 		{CPT2_LEVELED, "leveled"},
 		{CPT2_DEGROTATE, "degrotate"},
 		{CPT2_MESHOPTIONS, "meshoptions"},
+		{CPT2_COLOR, "color"},
+		{CPT2_COLORED_FACEDIR, "colorfacedir"},
+		{CPT2_COLORED_WALLMOUNTED, "colorwallmounted"},
 		{0, NULL},
 	};