[PATCH v4 0/5] MR7559: cfgmgr32: Implement CM_Register_Notification and CM_Unregister_Notification.

[Vibhav Pant (＠vibhavp)]

The methods are needed to implement Bluetooth device pairing in `bluetoothapis.dll` without having to create a dummy window for `RegisterDeviceNotification`, as that may break CLI applications.

`CM_Register_Notification` is implemented as a thin wrapper over `I_ScRegisterDeviceNotification`, mapping `DBT_*` flags to their associated `CM_NOTIFY_*` constants.

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  v4: user32: Remove incorrect FIXME warning while registering for DBT_DEVTYP_HANDLE notifications.
      cfgmgr32: Implement CM_Register_Notification and CM_Unregister_Notification.
      dinput/tests: Add tests for CM_Register_Notification.

https://gitlab.winehq.org/wine/wine/-/merge_requests/7559