v0.2.8

• Add preliminary support for applying rewrite rules to the MPD manifest before downloading media
  segments. Rewrite rules are expressed as XSLT stylesheets that are applied to the manifest using
  the xsltproc commandline tool (which supports XSLT v1.0). This allows complex rewrite rules to
  be expressed using a standard (if a little finicky) stylesheet language. See the --xslt-stylesheet
  commandline option.

  This functionality and API are experimental, and may evolve to use a different XSLT processor, such as
  Saxon-HE (https://github.com/Saxonica/Saxon-HE/) which has support for XSLT v3.0, but is
  implemented in Java. Alternatively, a more general filtering functionality based on WASM bytecode
  might be implemented to allow the implementation of rewrite rules in a range of languages that can
  compile to WebAssembly.

• Change the default ordering of muxer applications when saving media to a .webm container to prefer
  VLC over ffmpeg. With the commandline arguments that we use, ffmpeg does not automatically
  reencode content to a codec that is allowed by the WebM specification, whereas VLC does do so.

• Some limited DASH conformity checks will be run on manifests before downloading, which may
  generate warnings written to stderr. A surprising number of manifests, including some
  generated by the most widely used commercial streaming software, feature non-conformities such as
  incorrect values of @MaxWidth / @maxHeight or inserted advertising segments that don't respect
  @maxSegmentDuration).