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)
3 files changed