Debugger: Make "debug last debugger command" available for cpp+qml

Change-Id: I0fe8025efc519def5cdd837a18928474ce7229cd
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

src/plugins/debugger/qml/qmlcppengine.h

@@ -98,6 +98,7 @@ public:
 protected:
     void detachDebugger();
     void reloadDebuggingHelpers();
+    void debugLastCommand();
     void executeStep();
     void executeStepOut();
     void executeNext();