winecoreaudio: Create fake user-preference-tracking audio device.

[Ken Thomases]

This achieves the effect that Microsoft calls "Stream Routing", although not
in the same way as native WASAPI/MMDevAPI.

The fake device is reported out of AUDDRV_GetEndpointIDs and it is marked as
the default device.  If the client opens that device, we don't override the
initial device of the audio queue we create.  By default, it uses the user's
preferred device, tracking changes to that automatically.
---
dlls/winecoreaudio.drv/mmdevdrv.c |  177 ++++++++++++++++++++++++-------------
1 files changed, 114 insertions(+), 63 deletions(-)

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