Decoration: Handle facedir and wallmounted param2types with schematic rotation

src/mapnode.h

@@ -61,6 +61,17 @@ enum LightBank
 	LIGHTBANK_NIGHT
 };
 
+/*
+	Simple rotation enum.
+*/
+enum Rotation {
+	ROTATE_0,
+	ROTATE_90,
+	ROTATE_180,
+	ROTATE_270,
+	ROTATE_RAND,
+};
+
 /*
 	Masks for MapNode.param2 of flowing liquids
  */
@@ -181,6 +192,8 @@ struct MapNode
 	u8 getFaceDir(INodeDefManager *nodemgr) const;
 	u8 getWallMounted(INodeDefManager *nodemgr) const;
 	v3s16 getWallMountedDir(INodeDefManager *nodemgr) const;
+	
+	void rotateAlongYAxis(INodeDefManager *nodemgr, Rotation rot);
 
 	/*
 		Gets list of node boxes (used for rendering (NDT_NODEBOX)