winmm: Always check for open and close enents in wave test.

winmm: Always check for open and close enents in wave test.

Always check for open and close events.
Send WM_APP message to thread to terminate it rather than TerminateThread.
Fix CreateThread/waveOutOpen race by waiting for background thread to
run before waveOutOpen is called.
Add more non-hardware supported formats.  There is a bug in wave
mapper GetPosition when multiple headers are used and this helps
trigger it.