Multi-Vehicle Start/Pause Fixes

Fix resume mission item count bug

Remove WIP

there was bug  in orbitMapCircle.radius    line 392,     the radius is  default value 30  , and  no change when view circle  change

This is a partial workaround to testing using SITL where plane never lands

Also distinguish Emergency Stop better

* Added support for sat count to Sensors check control

* QGCCheckListItem -> PreFlightCheckButton
* CheckList -> PreFlightCheckList

Automated preflight checklist: Initial commit. Note that this requires an autopilot firmware that writes the respective health flags in the SYS_STATUS mavlink message

Signed-off-by: Patrick J.P <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>