Drop support for specifying demuxer types by numeric ID (options -demuxer, -audio-demuxer and -sub-demuxer). Stop printing the numeric values in "-demuxer help" output. Convert the list of DEMUXER_TYPE_XXX defines to "enum demuxer_type".
Drop support for specifying demuxer types by numeric ID (options -demuxer, -audio-demuxer and -sub-demuxer). Stop printing the numeric values in "-demuxer help" output. Convert the list of DEMUXER_TYPE_XXX defines to "enum demuxer_type".