Workout Controls for Train View

Fixes broken controls on train view, so we can now start stop
with the sidebar hidden and also adjust the settings for the
realtime dials on the layout.

Will need to think about saving the properties of the controls
to use last used settings.

Fixes #439.

src/MainWindow.cpp

@@ -394,7 +394,7 @@ MainWindow::MainWindow(const QDir &home) :
     // TRAIN WINDOW & CONTROLS
     trainWindow = new HomeWindow(this, "train", "Training");
     trainWindow->controls()->hide();
-    trainControls->addWidget(new TrainTool(this, this->home));
+    trainControls->addWidget(trainWindow->controls());
 
     // ANALYSIS WINDOW & CONTRAOLS
     analWindow = new HomeWindow(this, "analysis", "Analysis");