implement "doc-all", "doc-clean" and "doc-install" targets; cmake does not allow for custom target names with slashes, compare https://gitlab.kitware.com/cmake/cmake/-/issues/20774
implement "doc-all", "doc-clean" and "doc-install" targets;
cmake does not allow for custom target names with slashes,
compare https://gitlab.kitware.com/cmake/cmake/-/issues/20774

mbsim-env/fmatvec,mbsim-env/fmatvec