Restrict project visibility to associated groups, users or teams (implement permissions like for tickets)

The access to projects can currently be restricted only by putting them into different entities - however as you all know, it is very difficult to manage fine-grained entities and the possibilities are quite restricted.

It would be a great feature to add the possibility to restrict project visibility to associated groups, like it is already possible for tickets; e.g. it could be realized for "manager groups" or alternatively for Project Teams or single users.

User Story: The CIO manages projects in GLPI. He doesn't want that all IT can see all projects. He decides to add groups or single users as managers to the project (or alternatively defines the project team). In the profiles configuration, Technicians have the (newly proposed) permission "See group projects" and thus can access only their project.