Simplify PreFlightCheckButton implementation

PreFlight: Style cleanup and changes

* Added support for sat count to Sensors check control

Create standalone controls for PreFlight CheckList

PreFlight Check List: Control renaming

* QGCCheckListItem -> PreFlightCheckButton
* CheckList -> PreFlightCheckList

Pre-Flight Checklist: Coding style cleanup

Survey: Support for flying alternate transects (fixed wing only)

Plan: Large progress bar in Outdoor theme

Better help for alt mode

Generic PID tuning support

Allow custom build to hide Absolute Altitude in mission planning

CameraCalc: Add missing update triggers

Fix standalone coords affecting time/distance

Fixed Wing Landing Pattern: Visualize landing area

Update camera specs on creation

Battery2 work: Support in FactGroups and ArduPilot Power page

Fix action list showing empty

Use FW Landing visuals in Fly View