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Feature/require c++20

Timo Koch requested to merge feature/require-c++20 into master

Require the C++20 feature set of GCC 11 / Clang 14 and enforce C++20 mode.

Note that std::format although C++20 is not supported yet by GCC 11. Gridformat needs GCC 13 / Clang 15 but is not enabled by default, however when it is found there is no additional check and if using an older compiler compilation will fail.

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