Fixes a race condition (noted in a comment for wodOpen) when multiple
threads try to open the same wave-out device simultaneously.
Addressed by creating the device mutexes when the driver is
initialized, instead of as each device is opened.  Then use the mutex
to protect the open operation against races.  At the same time, made
the mutexes recursive to avoid self-deadlocks the driver was
encountering when reentered from the callback.

correct offsets, after the function data, so add cFuncs to the offsets
in MSFT_DoVars.

Resolve referenced types for variables.
Fixes initialisation of the dbgrid32 OCX.

Implement CryptBinaryToStringA and CryptStringToBinaryA based on Kai
Blin's base64 encoder/decoder.

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.