For SVGs, the generated Font weight is "regular" instead of "normal"

[LyGoeAbb]

The title is pretty self explanatory. The SVGs that are generated by this library use font-weight="regular" instead of font-weight="normal". The latter seems to be the standard: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/font-weight.

lines 678, 724, 1333, and 1433 of VectSharp.SVG/SVGContext.cs should be modified accordingly.

This irregularity causes compatibility issues, in my case with flutter_svg.

Thank you for maintaining this project.

[LyGoeAbb]

I opened a pull request with the proposed changes