Add SVG public API and xml entity handling #967

Job	Run time
cpp-lib-build (macos-11, clang, ON)	7m 37s
build (macos-11, tool)	1m 50s
cpp-lib-build (macos-11, clang, OFF)	7m 36s
build (macos-11, cpp)	31m 22s
cpp-lib-build (macos-11, gcc, ON)	7m 37s
build (macos-11, csharp)	8m 57s
cpp-lib-build (macos-11, gcc, OFF)	7m 55s
build (macos-11, dart)	5m 20s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 59s
build (macos-11, go)	4m 34s
cpp-lib-build (ubuntu-20.04, clang, OFF)	3m 19s
build (macos-11, java)	2m 2s
cpp-lib-build (ubuntu-20.04, gcc, ON)	4m 38s
build (macos-11, javascript)	2m 26s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 54s
build (macos-11, typescript)	19m 11s
cpp-lib-build (windows-2022, clang, ON)	4m 39s
build (macos-11, php)	12m 52s
cpp-lib-build (windows-2022, clang, OFF)	5m 46s
build (macos-11, python3)	1m 50s
cpp-lib-build (windows-2022, cl)	4m 35s
build (ubuntu-20.04, tool)	55s
build (ubuntu-20.04, cpp)	19m 6s
build (ubuntu-20.04, csharp)	5m 11s
build (ubuntu-20.04, dart)	3m 29s
build (ubuntu-20.04, go)	2m 53s
build (ubuntu-20.04, java)	1m 11s
build (ubuntu-20.04, javascript)	1m 38s
build (ubuntu-20.04, typescript)	9m 58s
build (ubuntu-20.04, php)	1m 16s
build (ubuntu-20.04, python3)	1m 18s
build (windows-2022, tool)	1m 40s
build (windows-2022, cpp)	22m 3s
build (windows-2022, csharp)	8m 11s
build (windows-2022, dart)	5m 5s
build (windows-2022, go)	4m 43s
build (windows-2022, java)	1m 52s
build (windows-2022, javascript)	2m 17s
build (windows-2022, typescript)	23m 46s
build (windows-2022, php)	3m 8s
build (windows-2022, python3)	1m 50s
	4h 34m 29s

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