Extract cmake functions dune_project into separate file

Simon Praetoriusrequested to merge
issue/extract-cmake-dune-project into master

Summary

The main cmake functions dune_project and finalize_dune_project are extracted into a separate file, including some macros used internally. The macros will be cleaned up in a separate merge-requests.

Depends on !1030 (merged) !1027 (merged) !1028 (merged)

Edited by Simon Praetorius

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