CMake

Add a few tests on XML escaping. #211

Job	Run time
Windows, shared, x64, with tests	20m 37s
Windows, shared, x64, vs2022, with tests	23m 4s
Windows, shared, x86	3m 24s
Windows, static, x64, with tests	19m 14s
Linux, shared, with tests	3m 56s
	1h 10m 15s

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