[jed4] Usergroup and permissions setup

[JazParkyn]

JED Users fit into one of the following groups.

• JED Administrators: members of the Core JED team and have all permission rights in the system.
• JED Listing Specialists: check listings when they are submitted or reported to ensure the listings comply with the ToS. They can also check and process tickets in permitted categories.
• JED Review Specialists: check reviews when they are reported and determine if those reviews comply with the ToS. They can also check and process tickets in permitted categories.
• JED Support Specialists: check and process tickets in permitted categories.
• JED Registered End Users (logged in): can add / edit their own extensions, leave reviews, report extensions / reviews, open tickets
• JED Public End Users (not logged in)

The permissions for each area of JED are detailed throughout the specifications document.