Change library group permissions

[elv-zenia]

Update labels:
Viewer -> View
Contributor -> Contribute
Reviewer -> Manage

Change checkbox inputs to radio inputs, making a single permission value selectable.
NOTE: Since library groups may have multiple permissions, I'm adhering to the current design of having multiple values in the metadata. When loading the permissions, the app will display the highest permission level found. If "reviewer" and "contributor" are found, it will save the "reviewer" value and display Manage. When saving, it will only save one value and delete any other existing permissions (applies to old group permissions).

Add remove button to the table of all group permissions:

• Content Library (new)
• Content Object (new)
• Access Group (existing/tested)
• Content Types (new)

Design note: The radio input is a new component in Frowser. I kept the design consistent with the checkboxes in the other Group Permissions modals.

Relates to #80

[elv-kevin]

Yeah this looks much better than the existing option

[elv-zenia]

I just realized this removed the ability to delete permissions for the library group. I added a way to remove from the table just like with Access Group members/managers. This also meant removing the table row link to the Access Group page.