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

editor/script/script_editor_plugin.cpp

@@ -77,6 +77,7 @@
 #include "scene/gui/tab_container.h"
 #include "scene/gui/texture_rect.h"
 #include "scene/main/node.h"
+#include "scene/main/scene_tree.h"
 #include "scene/main/window.h"
 #include "servers/display/display_server.h"