Use libxml2 for configuration parsing #1104

Job	Run time
Run Coverity tests	0s
Run CodeQL tests	4m 31s
Build on Fedora to fedora:38	3m 43s
Build on macOS for osx	8m 13s
Build on Fedora to fedora:39	2m 5s
Deploy pages	0s
Build on macOS for ios	2m 13s
Build on Ubuntu to ubuntu:20.04	3m 23s
Build on macOS for iossimulator	3m 7s
Build on Ubuntu to ubuntu:22.04	3m 26s
Build on Windows (143, x86)	9m 37s
Build on macOS for androidarm	2m 20s
Build on Ubuntu to ubuntu:23.10	3m 17s
Build on Windows (143, x64)	9m 57s
Build on macOS for androidarm64	2m 38s
Build on Windows (142, x86)	10m 17s
Build on macOS for androidx86_64	2m 25s
Build on Windows (142, x64)	8m 50s
	1h 20m 2s

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