systemfonts 0.3.0

• Added get_cached_face() so that other packages might retrieve FT_Face
  objects from the cache.
• Adapted cpp11
• Add infrastructe for setting OpenType font features on a registered font with
  either register_font() or the new register_variant(), along with the
  font_feature() function.

systemfonts 0.2.3

• Replace the buggy Freetype cache subsystem with own implementation
• Fix indexing bug in glyph_metrics()

systemfonts v0.2.2

• Fix remaining valgrind issues by fixing the included font-manager code
• Rewrite the text shaping algorithm to make it more future proof
• Work around a nasty freetype bug in their cache subsystem

systemfonts v0.2.1

• Various fixes to the correctness of compiled code

systemfonts 0.2.0

• Add string_widths_dev() and string_metrics_dev() to request the current
  graphic device for string widths and metrics.
• Add system for registering non-system fonts for look-up.
• systemfonts will now detect user-installed fonts on Windows
  (possible after the 1806 update)
• Font lookup is now cached for faster performance. The caching will get flushed
  when new fonts are added to the registry, or manually with reset_font_cache()
• Systemfonts now provide querying of font information with font_info() and
  glyph_info()
• Basic string shaping is now provided with shape_string()
• Line width calculation is now available with string_width() (ignores
  presence of newlines, use shape_string() for more complicated strings)
• Added str_split_emoji() for splitting of strings into substrings of emoji
  and non-emoji glyphs
• Provide a header file for easy use from within C in other packages
• Fix memory management issues on Mac
• Fix handling of erroneous font files on windows

systemfonts v0.1.1

• Fix compilation on systems with a very old fontconfig version (Solaris)

systemfonts v0.1.0

• First version with match_font() and system_fonts() capabilities. More to
  come.
• Added a NEWS.md file to track changes to the package.