Update / rewrite of the ofxSvg addon to remove dependency on libTinySvg and libxml2. #1658

Job	Run time
rpi-build (armv6l, armhf, arm-linux-gnueabihf, 1)	3m 0s
rpi-build (aarch64, arm64, aarch64-linux-gnu, 1)	3m 49s
build-emscripten (emscripten)	4m 12s
build-vs2022 (ARM64EC)	14m 13s
build-vs2022 (x64)	13m 19s
build-vs2022 (ARM64)	13m 8s
build-msys2 (ucrt64)	4m 46s
build-msys2 (mingw64)	4m 53s
build-msys2 (clang64)	5m 3s
build-macos (osx, makefiles)	1m 50s
build-ios-tvos (tvos, macos)	3m 6s
build-linux64 (linux64, 64gcc6)	4m 18s
build-android (android, x86_64)	8m 14s
build-macos (osx, xcode)	1m 6s
build-ios-tvos (ios, macos)	1m 56s
build-android (android, arm64-v8a)	8m 24s
build-android (android, armeabi-v7a)	8m 4s
	1h 43m 21s

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