Qml Debugger: Enable debugging qml+cpp standalone applications

A new debugger engine, QmlCppEngine, is introduced, which wraps gdb
and qml engines into one. Alternatively, if using Windows, Cdb is used
instead of Gdb.

Most of the debugger ui switcher is now rewritten, and it is tailored
for the QML and CPP layout case, the only one supported anyway.

Reviewed-by: hjk

src/plugins/debugger/qml/qmladapter.h

@@ -49,6 +49,8 @@ class DEBUGGER_EXPORT QmlAdapter : public QObject
 public:
     explicit QmlAdapter(DebuggerEngine *engine, QObject *parent = 0);
     void beginConnection();
+    void pauseConnection();
+    void closeConnection();
 
     bool isConnected() const;
     bool isUnconnected() const;