Decouple node.h from scene_tree.h, minimize its other includes

editor/script/script_text_editor.cpp

@@ -56,6 +56,7 @@
 #include "scene/gui/menu_button.h"
 #include "scene/gui/rich_text_label.h"
 #include "scene/gui/split_container.h"
+#include "scene/main/scene_tree.h"
 #include "scene/resources/style_box_flat.h"
 #include "servers/rendering/rendering_server.h"