MainWindow Refactor Part 1 of 5

Breaking the MainWindow 'god object' into
separate classes for Athlete and Context.

Further updates will need to;
- break MainWindow Gui elements into Toolbar and Views

- migrate from RideItem and Ridelist to ActivityCollection
  and Activity classes that are not tied into gui elements.

- introduce Application Context and AthleteCollection

Once these are done we will be in a position to decouple
most classes from mainwindow and also introduce tabbed
athletes.

src/GoogleMapControl.cpp

@@ -276,7 +276,7 @@ void GoogleMapControl::createHtml()
 QColor GoogleMapControl::GetColor(int watts)
 {
     if (range < 0) return Qt::red;
-    else return zoneColor(main->zones()->whichZone(range, watts), 7);
+    else return zoneColor(main->athlete->zones()->whichZone(range, watts), 7);
 }
 
 // create the ride line