fix-canvg Fix URLs for exportable

[ldtcooper]

• Add nwt import to exportable
• Fix CanVG imports

[narenranjit]

@ldtcooper Are these not available over npm?

[ldtcooper]

The official repo suggests using script tags for browser use. If I can use their server instructions for Contour, then I'll do that. This way also has the bonus of not requiring them unless they're needed, which is why it was done like this to start with.

[narenranjit]

If they were npm packages it'd be easy enough to configure webpack to conditionally load those files only when needed, but overkill for right now. This is an improvement over using a hardcoded svn repo anyway :)