netgen
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support Catch2 v3
- uses Cmake config files for Catch2
- supports both v2 and v3 of Catch2
- Catch2 v3 includes <catch2/catch_all.hpp> instead of <catch2/catch.hpp>
- v3 moves Catch::Contains to Catch::Matchers::ContainsSubstring
see https://github.com/catchorg/Catch2/blob/devel/docs/migrate-v2-to-v3.md
Patch adapted from debian patch catch2_v3.patch https://salsa.debian.org/science-team/netgen/-/blob/d7ca1c564d90d00ce3d83e0b63c36fbec11cf1ce/debian/patches/catch2_v3.patch