Fixed unused variable warning in GAudioOutput when speech is disabled.
Output clearer errors to the user if the UAS reports an error when sending missions.
Also these messages are now all translated.
Added a timestamp to when the mission list was last updated.
This code previously existed, but wasn't always triggered. Now it should be.
Set debug messages for rejected waypoint messages to specify which message was rejected.
Moved some more user-facing UI strings into translation calls.
Merge pull request #671 from Susurrus/missions

Minor improvements to UASWaypointManager.cc
Merge pull request #670 from Susurrus/speech_unused_var

Fixed unused variable warning in GAudioOutput when speech is disabled.
UAS threading improvements
Bumped config
Threading improvements
obey serial port intervals
Fix up threading of UAS object, WIP
threading fixes, still wip in some aspects
Threading fixes
Do not allow the PFD to turn QGC into a CPU hog