Internal: parse the SVG in the python side

[JosephBARBIERDARNAL]

https://github.com/linebender/resvg

[linear]

YEL-25

[JosephBARBIERDARNAL]

This would make things overall faster (?), with maybe both:

• slower runtime
• faster chart (no need to parse anymore = less javascript)

[JosephBARBIERDARNAL]

This could also fix #32

[JosephBARBIERDARNAL]

could also be a fun side project to make a dedicated python interface for resvg