Revert "Propose a RGB mediatype with negative height on connect."

This reverts commit 3e494f88c377600ca5ef17df529fcc954dea764d.

This change caused RGB output to fail with VSFilter and produced
flipped output with AviSynth DirectShowSource
[MPC-HC] Use our own ffmpeg clone repository.
[MPC-HC] Update ffmpeg for "avformat/mpegts: check avio_tell() return code before using it".

This commit fixes MPC-HC ticket #3466.
[MPC-HC] LAV Splitter: Exhibits MKV attachments through IDSMResourceBag interface.