Add the ability to mark a project as "Restricted" that will make this project hidden from all users except for the project Team (managers, resources, reviewer, sponsor, etc)
The project should be hidden in all paths:
1. Will not be retrieved during search.
2. Will not be calculated and show in reports
3. Will not be accessible from all paths: Add shortcut, add existing, link to issue
4. Will not be seen in Resource load and Resource calendar views (can be named "Restricted" to reflect the load).
5. Any other location i cant think of right now that will allow a non member of the project team to gain some sort of access to that project.
For future reference, the feature request ID is CR-21358.