QmlProfiler: Clean up the state widget

Ultimately we want this as jobs for the progress manager, but let's
get the logic right before. The state widget should not estimate
profiling times and it doesn't have to keep local copies of all the
state the model and state managers already have. Also, we need an
additional indication for "waiting for application to send data", as
that can take significant time.

Change-Id: I3677dea4b0561bc83a7bc3c196ce0854c5624f12
Task-number: QTCREATORBUG-12958
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

src/plugins/qmlprofiler/qmlprofilerstatewidget.h

@@ -50,13 +50,8 @@ public:
 private slots:
     void showText(const QString &text, bool showProgress = false);
     void updateDisplay();
-    void dataStateChanged();
-    void profilerStateChanged();
     void reposition();
 
-signals:
-    void newTimeEstimation(qint64);
-
 protected:
     void paintEvent(QPaintEvent *event);