Update to 0.10.1; bump ABI depends due to new fribidi dependency.

libass (0.10.1)
* Fix letter spacing
* Add \rSTYLENAME syntax support (GC #43)
* Fix border generation and border style reset (GC #56)
* Fix various issues with bug-for-bug compatibility of
  transformations (\fax, \fay, etc.) to VSFilter (GC #46, GC #42)
* Fix drawing parsing (GC #47)
* Various fixes to shaper (GC #54, GC #55, GC#59)
* Fix change detection
* Add ass_set_line_position API to set a vertical subtitle offset
* Fix scaling of drawing baseline offset (\pbo) values
* Fix skipping of zero-width characters for FriBiDi shaper
* Use LTR text base direction by default, similar to VSFilter

libass (0.10.0)
* Bidirectional layout and Arabic shaping via FriBidi (GC #13)
* OpenType shaping via HarfBuzz-ng (GC #13)
* Add API for shaper configuration
* Add support for `Language' Script Info property, this can be used for
  hinting the text language
* Vertical layout improvements
  * Use `vert' and `vkna' OpenType features for vertical glyph variants
  * Position rotated glyphs onto baseline
* Parse font encoding property for base text direction hinting
* Refactor cache system
* Use generic outlines in place of FreeType glyphs
* Direct outline bitmap rendering
* Fix whitespace trimming (GC #35)
* Do not render border if there's no shadow or glyph (GC #29)
* Adjust spacing after a italic to non-italic style change (GC #37)
* Fix fade timing
* Fix x positioning with borders (GC #27)
* Build system tweaks

(wiz)