systemfonts 1.2.0

• Providing the font name as the family should now result in better matching
• Improved the fallback options for Windows so that as many scripts are now
  covered
• Add infrastructure to add uninstalled font files to the search path used for
  font matching
• Add facilities to download and register fonts from web repositories such as
  Google Fonts and Font Squirrel
• Add require_font() that does it's best to ensure that a given font is
  available after being called.
• Added functions for extracting outline and raster representation of glyphs