Ability to show/hide Request Types based on Organization Membership

Suggestion

Following the addition of the 'Organizations' feature in JSD-270 it would be useful if we could show or hide Request Types based on what Organization the user belongs to.

Example

User A is set up and is added to Organization A

User B is set up and added to Organization B.

A new Request Type called Request A is set up

Permissions are added to Request A so that only Organization A can view it in the portal

This means that User A can see this Request Type when they login to the Portal, but User B cannot

Why it would be useful

This would be useful as we are currently dealing with multiple clients within a single Service Desk. The ability to do this would allow us to personalize a portal for each client that we have.