Only support the SYSTEM_MEDIA_TIME for now.

If the buffer is created and stopped, the contents of the buffer are
indeterminate, by zeroing it you won't get leftovers from last play.

Use the fallback system IReferenceClock, unless the app comes up with
its own clock.

wininet: If we receive an error from InitializeSecurityContext in HTTP_DoAuthorization then set pAuthInfo->finished so that we don't carry on using the security context.

wininet: Assume that if we're connected to an HTTP/1.1 server then connections can be kept alive by default.

So don't close the connection in this case in HTTP_FinishedReading.

Also checks for VFW_E_NOT_STOPPED that is allowed to cause a
disconnection to fail.

RemoveFilter is better at removing a filter from a filtergraph then
some method there.

dsound: Set the status from STATE_STARTING to STATE_PLAYING before mixing our next buffer so that we do not potentially skip early event when starting.