systemfonts 1.3.0

• Fixed a bug in the URL generation for Google Font imports
• Added support for Bunny Fonts imports (#132)
• Begin deprecation of bold argument in favour of weight throughout package
• Improve messaging in require_font()
• Fonts are automatically added to the session when an import is created (#131)
• Fixed a bug in converting font weights as reported by macOS into ISO-style
  weight used by systemfonts and FreeType
• require_font() now better handles lack of internet access
• Added plot_glyph_stats() to provide visual explanation for various glyph
  measures
• font_info() now returns the PostScript name of the font in the name column
• Added support for variable fonts throughout the package. Other packages will
  need to be upgraded to take advantage of this. A new function
  font_variation() can be used to define coords for the variation axes
• Fixed a bug in webfont download on Windows where fontfiles would become
  corrupted (#134)
• Fixed an issue in textshaping where conflicting DLL names resulted in the R
  process inability to render text if textshaping was loaded first
  (textshaping#36)
• Add a way to test if the freetype version matches between systemfonts and
  another package match
• Added a name column to the output of glyph_info() to report the name of
  the glyph is provided by the font
• Added a charmaps column to the output of font_info() to report the name of
  the character maps provided by the font
• Cached faces are now reference counted when they are handed off to another
  package and it is the other packages' responsibility to decrement the
  reference by calling FT_Done_Face() when finished with it.