Put audio output into a worker thread.

Bump Linux Qt requirement to 5.3 in README

Remove unnecessary QGCStatusBar

Uninstall is in Add/Remove Programs

Verify that protocol files are not out of date

Separate install of SDL on OS X not needed

Delete any temp log file before each unit test case

New FactSystem

Allows parameter access from QML among other things

This reverts commit 4d033715.

Move Windows sound API to right thread context and make it an object member. Perform init within the right thread context. Add capability to play .wav files in addition via QMultiMedia

The derived class wasn’t really adding any capabilties

- Fixed start menu shortcut delete on uninstall
- Uninstall no longer on start menu

Bug fixes

So no need for connect window close test here

Also moved log file settings save check to mavlink protocol