forces the a preferences to be workspace specific (if it can be)
to be used if one wants to in-place edit a preference that should be workspace specific

- added option to also retrieve (merely) managed projects
- added option to filter out the global project
- also exposed the options in the usermanagement controller (user_projects)

- for ProjectItem and WorkgroupItem

- removed unneeded functions from user model
- fixed permission tool
- updated extension permission test