- allow unit tests to use QGCApplication
- clear global singletons for each unit test run

This disables Windows C Runtime assert dialogs from popping up.

Also commented out noisy serial link error output

Also fixed a number of other release build problems

Change so Waypoints are the same across maps, and offline waypoints get appeneded to the end of the MAV's waypoint list on connect

Added a qDebug() message handler for windows installs that have no debug helpers. Hunting bug in Mode change in UASView

Major cleanup of MainWindow constructor. All widgets have now the visible property set to false on its constructor

Switched from flite for speech on the Mac to built-in MacOSX speech synthesizer. Fixed build system for 64-bit builds (using official SDL.framework, and Qt frameworks).