CMake refactoring

• Move all compiler specific settings to extra files in cmake/compileroptions
• introduces minimal versions for the compiler so that std::filesystem is fully supported (according to this table
• remove testfilesystem and enforce compiler/libstd version where it is implemented in std::filesystem
• bump minimal version to cmake 3.24
• use CMAKE_COMPILE_WARNING_AS_ERROR instead of adding these flags manually
• removed a few old work arounds for unsupported compilers
• removed compiler
  • PGI
  • NEC SX