Also:
- Prompts to reset trims to zero prior to calibrate
- Turned of radio check for now since it prevents spectrum bind

- Download working again
- Fixed lots of bad error handling

writeFileAccumulator contents cleared on errors, nack or ack timeout
memcpy used to transfer data to request message buffer

QGCUASParamManager and friends are replaced by FactSystem

When you load a waypoint files, the changes you're doing in the waypoint list
(for example, changing the longitude of a waypoint) are not applied to the points
displayed on the map.
This commit fixes this issue.