Added serialization for structures

src/modules/stream/stream.h

@@ -5,6 +5,7 @@
 #include <tuple>
 #include <algorithm>
 #include <scene/3d/spatial.h>
+#include <core/io/config_file.h>
 class VoxelViewer;
 class VoxelLodTerrain;
 class StreamWorld : public Spatial {
@@ -13,6 +14,7 @@ private:
 	VoxelViewer *viewer;
 	VoxelLodTerrain *terrain;
 	Node *current_scene;
+	ConfigFile config;
 	struct building {
 		String id;
 		int pattern_id;