Add MSVC build fixes for AVS3-enabled LAV build

MatroskaParser: increase maximum CodecPrivate to 64MB

avutil/tx: disable debug code

avformat/avisynth: set r_frame_rate in addition to the average frame rate

hevc: enable d3d11 decoding for 420 12-bit, and 422/444 content

hwcontext_d3d11va: add a mapping for P010 DXGI -> P010 AV pixel formats

dxva2_hevc: support for HEVC RExt profiles

hevc: export the rext profile as an AVOption

avcodec/h265_profile_level: add a numeric rext profile identifier

configure,compat: add detection and fallback for DXVA_PicParams_HEVC_RangeExt

MatroskaParser: increase max string length

matroska/h264: export x264_build SEI data as side data

matroskadec_haali: migrate to new side data functions

Restore channel count/layout update flags

matroskadec_haali: parse track dispositions