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

So no need for connect window close test here

Also moved log file settings save check to mavlink protocol

Also added/converted some logging to debug the problem caused by the
two parameter request apis.

This removes confusion as to whether you call UAS::requestParameters
(incorrect) or QGCUASParamManager::requestParameterList (correct) from
client code.