HTML &#; entities not supported

[mcclure]

nanosvg.h does not appear to currently support HTML entity codes, such as &#59; for ". This is troublesome because some special characters like "<> can only appear in some positions as entities. A tool I am using ("Figma") is encoding a > characters in a shape id as &#62;, which is causing problems for my program when it tires to read that id using nanosvg (and it sees a raw &#62; instead of the < it expects).

I wrote a small &# code decoder and would like to upstream it as a PR. However, I'm not sure exactly where to put it. I think the place to put the entity decode is

	} else if (strcmp(name, "id") == 0) {
		strncpy(attr->id, value, 63);

in nsvg__parseAttr, either right after the strncpy or possibly replacing it. However, are there other places it is appropriate to do HTML entity decoding in such a patch? For example are <text> tags currently supported?