debugger: fix translation contexts

* add a few Q_OBJECT
* change DebuggerRunControl::tr() to DebuggerPlugin::tr()

Change-Id: I7ed973ea71b3492e91b45784595d9471587f72ea
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

src/plugins/debugger/watchwindow.h

@@ -86,6 +86,8 @@ private:
 
 class WatchWindow : public BaseWindow
 {
+    Q_OBJECT
+
 public:
     explicit WatchWindow(WatchTreeView::Type type)
         : BaseWindow(new WatchTreeView(type))