Merge pull request #1151 from amtriathlon/master

Fixed pace histogram shading when there is no Pace Zones defined
Deprecate kickr command channel

.. Wahoo don't do that anymore.

.. now use the same channel as the device and just send plain old
   ANT+ messages to set slope etc (why they didn't do that in the
   first place is absolutely beyond me)

.. getting ready to implement Kickr for the THIRD time !!!
Added pace zone shading to CPPlot
When enabled it is convenient to set a filter for running activities in the chart since this is not done automatically yet