new wasapi device monitoring interface

Signed-off-by: Jonathan Yong <10walls@gmail.com>
expose wasapi monitoring interface

Signed-off-by: Jonathan Yong <10walls@gmail.com>
add audio/out/ao_wasapi_changenotify.c to build

Signed-off-by: Jonathan Yong <10walls@gmail.com>
expose some ao_wasapi_utils code for the rest of wasapi output

Signed-off-by: Jonathan Yong <10walls@gmail.com>
attempt to auto reset on wasapi device change

Signed-off-by: Jonathan Yong <10walls@gmail.com>
mark vtable as static