Add Raster Graphics Canvas for Node.js

[Danielku15]

If somebody plans to use alphaTab from a Node.js backend, only SVG rendering is available which is targeting the CSS based SVG strings.

There are some libraries like skia-canvas or node-canvas which are almost HTML5 canvas compatible. Should be fairly easy to add support for raster graphics rendering there. Only the font-loading is the tricky part which needs to be addressed.

[Danielku15]

Now available via alphaSkia