Winmm reliability for large messages, winmm compatibility with applications that don't coinitialize

[garydan42]

1. fix an issue with winmm clients connecting both midi in and midi out data flows, which will cause issues when the buffer gets full.
2. route wdmaud2.drv directly through the midisrv transport via a library, bypassing cocreate/coinitialize requirements for using the transport dll. it's not safe for wdmaud2.drv to coinitialize for the client applications threads, so this solution avoids needing a worker thread to perform the com calls, and added latency/overhead of doing that.
3. midi port names should be the group number, not group index.
4. enable x86 building in VS, so the wdmaud2.drv for syswow64 can be compiled through VS.