Changed QML Inspector from a separate global mode to a plugin.

The new QML Inspector depends on DebuggerPlugin. Also added a dropdown menu into
the debugger toolbar from which the user can select the used debugging
language, e.g. C++ or QML.

src/plugins/debugger/debuggermainwindow.h

@@ -0,0 +1,28 @@
+#ifndef DEBUGGERMAINWINDOW_H
+#define DEBUGGERMAINWINDOW_H
+
+#include "debuggeruiswitcher.h"
+#include <utils/fancymainwindow.h>
+
+
+class QMenu;
+
+namespace Debugger {
+
+class DebuggerMainWindow : public Utils::FancyMainWindow
+{
+public:
+    DebuggerMainWindow(DebuggerUISwitcher *uiSwitcher, QWidget *parent = 0);
+    ~DebuggerMainWindow();
+
+
+protected:
+    virtual QMenu *createPopupMenu();
+
+private:
+    DebuggerUISwitcher *m_uiSwitcher;
+};
+
+}
+
+#endif // DEBUGGERMAINWINDOW_H