- cancel support
- mag rotation images
- set board rotation before cal
- set compass rotation after mag cal

If we get a dup, clear the default value since we can’t trust it

Also updated parser for new xml format

Use default font wherever possible. Where that doesn’t work, use
ScreenTools::dpiAdjustPointSize.

More consistent with Qml usage pattern

Also changed to pull specific small parameters set after cal instead of
full refresh. This way, the red/green indicators update much more
quickly.