This adds a flag "archived" to repositories. Repositories marked with this can no longer be modified in any way. To do this, we switch to a new version of Shiro Static Permissions (sdorra/shiro-static-permissions#4) and specify a permission guard to check for every permission request, whether the repository in question is archived or not. Further we implement checks in stores and other activies so that no writing request may be executed by mistake.
Co-authored-by: Eduard Heimbuch <eduard.heimbuch@cloudogu.com>
