Merge branch 'edl'

Merge branch 'edl'

* edl:
  core: support timeline with audio-only files
  core: wake up a bit less often for audio-only files
  core: audio: cut audio writes at end of timeline part
  EDL: add support for new EDL file format
  stream.[ch], ass_mp: new stream function for whole-file reads
  tl_matroska.c: move the find_files() function here
  bstr.[ch], path.[ch]: add string and path handling functions
  core: ordered chapters: move timeline creation to timeline/
  options: drop support for numeric -demuxer values
  cleanup: demuxer.[ch]: remove unused code, make functions static
  cleanup: reindent demuxer.h, use struct names for types