Changed to get the current voice properties, then modify then and set new ones.

When unit tests are being run in TeamCity the host box can end up being
very bogged down with other builds. So need to up wait time, to take
into account CPUs grinding.

Need to disambiguate from video stream messages

Found by valgrind.

Found via valgrind.

I don't think it's needed anywhere in QGC since this has been a bug for a long time.

SLUGS has maintained their patches out-of-tree for a long while now.
These will eventually get merged back in, but it'll be easier to evaluate them as fresh commits instead of modifications to this old & dead code, so we'll delete this for now.

Remove isnan() and isinf() templates from QGC.h for Windows builds, this
generates errors (already defined in math.h).

Broke windows compilation.

Add debug output for when voice initialization fails on Windows

Removed or annotated existing commented-out code

Clean up logic for saying emergency text.

Previous code didn't properly check for if speech was enabled.

Some functionality was lost, will need to be fixed in a later commit.