Remove H264RandomAccess class and rely on avcodec instead
Remove stdint.h in favor of Visual Studio official stdint.h

As of Visual Studio 2010, Microsoft provides their own stdint.h, so this
replacement version is long obsolete.
Disable MPEG-TS H.264 to AVC1 conversion by default

The conversion is not required for any competent decoders. However for
compat reasons still send a AVC1 type as a second media type for legacy
decoders.
Remove entry which was previously forgotten.
Fix handling of WMVA video with the DMO decoder
[MPC-HC] Use our own ffmpeg clone repository.

WARNING: This should be the first custom commit in our fork and its title should not be modified.
[MPC-HC] LAV Splitter: Exhibits MKV attachments through IDSMResourceBag interface.
[MPC-HC] Tray icon: Add an optional custom callback for "show property page" events.
[MPC-HC] Fix the include directories for FFmpeg's out-of-source-tree build.
[MPC-HC] Version number: Add a "git describe based" commit number to identify the vanilla LAV Filters we are based on.

This way if we distribute LAV Filters version X.Y.Z.N, it means that our custom build is based on:
 - the stable version X.Y.Z,
 - with N official patches (which will be part of next official LAV Filters build),
 - and some custom non-official patches which are here to improve the integration in MPC-HC.