Add/remove users from multiple workspaces at once

Description:

I am requesting the ability to add and remove users to/from multiple workspaces at once.

As it stands, in order to add a user to a workspace they are added to a model within that workspace. Therefore to add a user to multiple workspaces this process must be repeated for each workspace.

The same method applies when removing a user - they must be removed by entering at least one model on each workspace and deleting that user.