- Update to version 0.15.0
  * Fix backwards/VSFilter-incompatible font sizes with FreeType
    2.10+
  * Improve speed via better caching
  * Require HarfBuzz unconditionally to ensure good shaping for
    complex scripts
  * ass_set_use_margins(true) now simply places text on the whole
    screen instead of attempting to tie it to video positioning
    (set by the margin values) and failing in various ways when
    margins are used to implement pan & scan in a video player
  * Add ass_track_set_feature() & catch-all
    ASS_FEATURE_INCOMPATIBLE_EXTENSIONS
  * Add ASS_FEATURE_BIDI_BRACKETS to enable Unicode 6.3+ bracket
    matching when applying the Unicode Bidirectional Algorithm
    (incompatible with VSFilter; requires libass built with
    FriBidi 1.0+)
  * Fix stack overflow on deeply nested \t tags
  * Fix positioning of events with leading line breaks
  * Fix small but nonzero \bord becoming \bord0 (regression in
    0.14.0)
  * Measure BorderStyle=4 box padding from glyph border, not
    from glyph fill
  * Scale everything from script resolution if storage size is
    not set (including borders and shadows regardless of
    ScaledBorderAndShadow)
  * Fix the default aspect ratio calculation when neither
    ass_set_pixel_aspect() nor ass_set_aspect_ratio() is called
  * Multiple fixes for karaoke override tags
  * Handle memory allocation failures better:
    avoid some crashes and produce images closer to truth
  * Avoid some integer overflows
  * Add internal infrastructure for regression testing
  * Improve VSFilter compatibility:
    + Treat invalid nested \t tags like VSFilter
    + Make \t(T,T,...) at time exactly T use the post-transition
      values
    + Make lines stack more like they do in VSFilter
    + Default ScaledBorderAndShadow to 0 (like VSFilter),
      except for subtitles that were produced by old FFmpeg/Libav
    + Make shadow positioning with 3D transforms match VSFilter's
    + Cut out glyphs from border & shadow in all the same cases
      as VSFilter
    + Match VSFilter on animated color tags with negative
      acceleration
    + Fix parsing of some files that VSFilter accepts but libass
      didn't by ignoring leading whitespace in each line of an
      ASS file or CodecPrivate
    + Improve font selection with CoreText
    + Stop faux-bolding fonts that are too bold to get faux bold
      in VSFilter
    + Ignore leading/trailing spaces when calculating height of
      nonblank lines
    + Match VSFilter on \fade with large alpha value arguments
    + Stop splitting bitmaps on font substitution
    + Multiple fixes for Banner and Scroll effects
    + Multiple fixes for karaoke override tags

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