feat(editor): edit session (-edit) and scenery layers

application/drivermode.h

@@ -116,4 +116,5 @@ private:
     int iPause { 0 }; // wykrywanie zmian w zapauzowaniu
 	command_relay m_relay;
 	std::string change_train; // train name awaiting entering
+	bool m_editorpending { false }; // scenery was opened for editing, switch to the editor after the initial update
 };