Auto Interval Discovery (Part 2 of 3)

In this part we have updated all the charts to reference
the RideItem::intervals() members instead of the TreeWidget
and RideFile::intervals().

The code to create/change/delete intervals is not included
so selecting and editing on charts/sidebar is disabled til
part 3 of the update, but hover should work properly.

Still left todo in future updates;

    * Updates to the interval sidebar to list intervals
      in a tree (by interval type) with a color selector

    * Code to create, edit, delete etc the intervals via
      the rideitem/intervalitem and see them reflected in
      the ridefile

    * Update to search for all the different types of
      IntervalItems including routes and sustained intervals

src/AnalysisSidebar.cpp

@@ -404,6 +404,7 @@ AnalysisSidebar::addIntervalForPowerPeaksForSecs(RideFile *ride, int windowSizeS
                          ride->timeToDistance(i.start),
                          ride->timeToDistance(i.stop),
                          context->athlete->allIntervals->childCount()+1,
+                         QColor(0,0,0),
                          RideFileInterval::PEAKPOWER);
     peak->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsDragEnabled);
     context->athlete->allIntervals->addChild(peak);