Rename RosAudioSrv to AudioSrv in audio service itself and in all system components which are related to this, same as it done in Win2k3.
It allows MS DxDiag to detect the system audio service correctly, so it becomes possible to run DirectSound test properly with MS dsound.dll, although it works with some minor errors and only in older VirtualBox versions, ~ up to 5.1.38 (and in other emulators as well).
CORE-16307
- Open a separate mixer instance for the page, so that MM_MIXM_CONTROL_CHANGE notifications can be received.
- Keep line and channel configurations in a global struct.
- Handle MM_MIXM_CONTROL_CHANGE and WM_HSCROLL notifications.
