Editor: Restructure editor code

Moving various editor files into sub folders to reduce clutter

editor/editor_node.h

@@ -33,8 +33,8 @@
 #include "core/object/script_language.h"
 #include "core/templates/safe_refcount.h"
 #include "editor/editor_data.h"
-#include "editor/editor_folding.h"
 #include "editor/plugins/editor_plugin.h"
+#include "editor/settings/editor_folding.h"
 
 typedef void (*EditorNodeInitCallback)();
 typedef void (*EditorPluginInitializeCallback)();