Update / rewrite of the ofxSvg addon to remove dependency on libTinySvg and libxml2. #1342

Job	Run time
build-linux64 (linux64, 64gcc6)	3m 30s
build-emscripten (emscripten)	3m 38s
build-ios-tvos (ios, macos)	1m 42s
build-macos (osx, xcode)	57s
build-ios-tvos (tvos, macos)	2m 56s
build-msys2 (mingw64)	4m 12s
build-macos (osx, makefiles)	1m 31s
build-vs2019 (x64)	1m 25s
build-msys2 (ucrt64)	4m 12s
build-msys2 (clang64)	4m 15s
build-vs2022 (x64)	7m 24s
rpi-build (armv6l, armhf, arm-linux-gnueabihf, 1)	2m 23s
build-vs2022 (ARM64)	7m 27s
rpi-build (aarch64, arm64, aarch64-linux-gnu, 1)	2m 4s
build-vs2022 (ARM64EC)	7m 26s
	55m 2s

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