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CMake fixes

Liam Keegan requested to merge cmake_issues into master

@santiago.ospina not sure if you want to merge all these changes, but with these changes I could then use the installed dune-copasi from another project cmakelists with:

find_package(dune-common REQUIRED)
find_package(dune-geometry REQUIRED)
find_package(dune-uggrid REQUIRED)
find_package(dune-grid REQUIRED)
find_package(dune-istl REQUIRED)
find_package(dune-localfunctions REQUIRED)
find_package(dune-pdelab REQUIRED)
find_package(dune-copasi REQUIRED)
  • use dune-copasi-installed-targets.cmake filename for exported targets as dune-copasi-targets.cmake is already used by finalize_dune_project
  • export build tree targets to CMAKE_CURRENT_BINARY_DIR
  • add missing header files
  • remove filesystem fallback as c++20 now required so can assume std::filesystem

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