Allow custom XML parsers #157
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This small PR allows users to pull in their own XML parser, like for example https://github.com/leethomason/tinyxml2.
(1) It uses NanoSVG's existing XML parsing abstraction and just exposes it for users.
(2) Using a custom parser, it's quite easy to fully and elegantly support
<use>tags in SVGs, which would be very cumbersome in NanoSVG directly.(3) Many other features can be implemented through external XML rewriting in this custom parser, without having to touch NanoSVG, including some existing PRs (e.g. #123).
For a working example of (2), see
NanoSVGVisitorin https://github.com/poke1024/tove2d/blob/master/src/cpp/nsvg.cpp).