Implement IAMAsyncReaderTimestampScaling and IAMPluginControl using IDL. Remove manual definitions of these interfaces from strmif.idl and replace them with IDL in axextend.idl. Signed-off-by: David Wohlferd <dw@LimeGreenSocks.com> (cherry picked from commit 6feb5ed43bc1db0af893c03eb862415bfdd011bb)