Tidy WebKit Scrollbars

.. to match the rest of the widgets
Webkit scrollbar Mac styling

.. to match the Mac scrollbars in QT5
Scrollbars on AllPlotWindow

.. made to look the same as everywhere else
   i.e. not clunky and ugly.
Scrollbars on LTM

.. think that is the last of them.
Activity Log Scrollbar

.. aka RideNavigator when not in mainwindow mode
Default font size should be 10 not 12

.. Thanks to Jörn Rischmüller for highlighting
   this issue.
More default font fixup

.. looks like 12 was the default -- which is
   totally inappropriate.
Fix stylesheet/palette gotcha on AllPlot

.. mucked up the reset of the palettes for all
   the widgets when setting the stylesheet for
   the scrollareas.
Mac CSS Scrollbar fix

.. is invisible on a black background, so added an inset box shadow
Mac ride list nit

.. got rid of unneccessary line
Keep the box on ride list for Mac

.. introduced a bit of a glitch.
Merge remote-tracking branch 'upstream/master'