* upgrade to clang-format-10

* before debugging mixedfemwave

* fix all compilation errors.

* fix include order...

* update README.md

* fix ci

* fix clang-format

* fix clang-format...

* ci: speedup compilation of dependencies.

* fix release mode linker error

* optimize ci to build only one exercise at a time and delete it again afterwards...

* exclude CMakeFiles

* improved version...

* fix

* bugfix

* debug...

* debug for real...

* debug...

* debug...

* workaround std::filesystem

* enable all tests...

* now for real :)

* try again

* again...