Rotate dashboard gauges

Rotate dashboard gauges

Use Transform.rotate to rotate the CircularProgressIndicator and
associated custom painter widgets used for the speed, rpm, and fuel
gauges on the dashboard page by 180 degrees.  Having the progress
bars start from the six o'clock position looks more like existing
systems and should better match user expectations.  Future work
should likely involve an investigation into using something other
than the highly limited CircularProgressIndicator widget.

Bug-AGL: SPEC-5043

Change-Id: I1bbc3abd2eb4ca362bf92cd06495a3b0a5154843
Signed-off-by: Scott Murray <scott.murray@konsulko.com>