Use libxml2 for configuration parsing #1129

Job	Run time
Run Coverity tests	0s
Build on Fedora 38	2m 12s
Run CodeQL tests	5m 47s
Build on Fedora 39	2m 4s
Build on macOS for osx	7m 30s
Deploy pages	0s
Build on macOS for ios	2m 44s
Build on Ubuntu 20.04	3m 41s
Build on macOS for iossimulator	3m 27s
Build on Windows (143, x86)	10m 15s
Build on Ubuntu 22.04	3m 25s
Build on macOS for androidarm	2m 31s
Build on Windows (143, x64)	11m 44s
Build on Ubuntu 23.10	3m 14s
Build on macOS for androidarm64	2m 51s
Build on Windows (142, x86)	10m 38s
Build on macOS for androidx86_64	3m 0s
Build on Windows (142, x64)	9m 38s
	1h 24m 41s

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