Support raw dvdsub palette as stored on normal dvd's

This is how the palette is stored on dvd's. Currently
only xbmc passes the palette information to libavcodec
this way.
Check return value of avio_seek and avoid modifying state if it fails

The code still modifies state if the timestamp is not found. Not
sure exactly how to avoid that.
asf hacks
0005-if-av_read_packet-returns-AVERROR_IO-we-are-done.-ff
0006-added-Ticket-7187-TV-Teletext-support-for-DVB-EBU-Te
Don't accept mpegts PMT that isn't current
Don't reparse PMT unless it's version has changed
0010-Read-PID-timestamps-as-well-as-PCR-timestamps-to-fin
0011-Get-stream-durations-using-read_timestamp
0013-aacenc-add-recognized-profiles-array
changed: allow 4 second skew between streams in mov before attempting to seek
fixed: memleak in mpegts demuxer on some malformed (??) mpegts files with too large pes packets

at-visions sample file brokenStream.mpg
Speed up mpegts av_find_stream_info
dxva-h264 Fix dxva playback of streams that don't start with an I-Frame.
0024-add-public-version-of-ff_read_frame_flush