svglite 2.2.0

• Added support for luminance masking (#174)
• Fixed a bug in calculating text widths when using font features (#175)
• Added support for path stroking and filling (#174)
• Added support for groups along with affine transformation and color blending.
  No support for Porter-Duff composition as it is porly supported in SVG (#174)
• Added better support for specifying webfonts as embedded in the SVG (#182)
• Added support for glyphs by rendering them as paths or rasters. This means the
  text is not editable in post-production but it is better than nothing.