-fixes and more fixes to new scene system, seems stable now..

BUT DONT TRUST ME IT MAY STILL BREAK, USE WITH CARE!!

scene/main/instance_placeholder.h

@@ -0,0 +1,37 @@
+#ifndef INSTANCE_PLACEHOLDER_H
+#define INSTANCE_PLACEHOLDER_H
+
+#include "scene/main/node.h"
+
+class PackedScene;
+
+class InstancePlaceholder : public Node {
+
+	OBJ_TYPE(InstancePlaceholder,Node);
+
+	String path;
+	struct PropSet {
+		StringName name;
+		Variant value;
+	};
+
+	List<PropSet> stored_values;
+
+protected:
+	bool _set(const StringName& p_name, const Variant& p_value);
+	bool _get(const StringName& p_name,Variant &r_ret) const;
+	void _get_property_list( List<PropertyInfo> *p_list) const;
+
+	static void _bind_methods();
+
+public:
+
+	void set_path(const String& p_name);
+	String get_path() const;
+
+	void replace_by_instance(const Ref<PackedScene>& p_custom_scene=Ref<PackedScene>());
+
+	InstancePlaceholder();
+};
+
+#endif // INSTANCE_PLACEHOLDER_H