Merge branch 'sub'

Merge branch 'sub'

* sub:
  sub/OSD: move some related files to sub/
  subtitles: options: enable -ass by default
  subtitles: change default libass rendering style
  demux_mkv, chapters: change millisecond arithmetic to ns
  cleanup: rename ass_* functions to mp_ass_*
  subs: use correct font aspect ratio for libass + converted subs
  cleanup: some random minor code simplification and cleanup
  vf_vo: fix EOSD change detection bug
  sd_ass: remove subreader use, support plaintext markup
  subtitles: style support for common SubRip tags and MicroDVD
  core: ordered chapters: fix bad subtitle parameter
  subs/demux: don't try to enable sub track when creating it
  subtitles/demux: store duration instead of endpts in demux packets
  subtitles: add framework for subtitle decoders
  options: add special -leak-report option
  subtitles: remove code trying to handle text subs with libavcodec
  cleanup: move MP_NOPTS_VALUE definition to mpcommon.h
  subtitles: move global ass_track to struct osd_state
  core: move most mpcommon.c contents to mplayer.c
  core: move global "subdata" and "vo_sub_last" to mpctx
  subtitles: remove sub_last_pts hack
  options: move -noconfig to option struct, simplify