Fix or workaround recent extension API compatibility issues

- Add compatibility methods for `RenderingDevice::shader_create_from_bytecode`
  and `CodeEdit::get_text_for_symbol_loopup`.
- Silence errors which now have compatibility methods.
- Acknowledge GraphEdit/GraphNode compat breakage, intended and WIP.

scene/gui/code_edit.h

@@ -287,6 +287,11 @@ protected:
 	void _notification(int p_what);
 	static void _bind_methods();
 
+#ifndef DISABLE_DEPRECATED
+	String _get_text_for_symbol_lookup_bind_compat_73196();
+	static void _bind_compatibility_methods();
+#endif
+
 	virtual void _update_theme_item_cache() override;
 
 	/* Text manipulation */