Update values for rights@kind=Access to Files (#156)

* Update values for rights@kind=Access to Files

Why these changes are being introduced:
* Requested rights value changes from UXWS & EngX

How this addresses that need:
* Update get_rights method to use new value strings and corresponding unit tests
* Update dependencies

Side effects of this change:
* None

Relevant ticket(s):
* https://mitlibraries.atlassian.net/browse/GDT-247

* Update value casing for consistency per UXWS & EngX request