- Sensors summary now shows you how man compasses you have
- Fix for APM accel cal. Can only use first accel offsets.

Plus lots of other tweaks to ui for visuals

Everything is now based off of default font pixel size

Also adding a constant for the font size in SensorComponent.

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

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

Passing parameters QVariantMap across C++ boundary was causing crashes
in Qt due to Qml array bugs. Referencing same Fact* across Qml boundary
in multiple QQuickWidgets caused jScript GC to crash.