Duplicate reparsing in SVG Rendering native example

[simbleau]

render_svg() in the example is loading and reparsing the file every frame, which was definitely not intended... I'll make a PR tomorrow or soon when I have time to fix that.

[raphlinus]

Heh yes. One reason I haven't done anything about this is that we intend to put in an API for scene fragments. With that API, you'd load, parse, and create a fragment once, then render that fragment (possibly with different scale, clip, blend, etc) as many times as you like.

But that won't land for a bit so it makes sense to have something in place to get meaningful measurements.