Clears the persisted settings for the QGC

This disables Windows C Runtime assert dialogs from popping up.

Recent threading changes have broken both of these. They will be fixed
in a separate pull request. Also added new CmdLineOptParser.cc/h

Fixed unused variable warning in GAudioOutput when speech is disabled.

Minor improvements to UASWaypointManager.cc

This code previously existed, but wasn't always triggered. Now it should be.

Also these messages are now all translated.