[OzzModz] XFRM: External URL Grouped Whitelist 2.0.0 Patch Level 1

Rquested by @duel

Requirements:
XenForo Resource Manager 2.2.0

Advanced version of this add-on: https://snogssite.com/threads/ozzmodz-xfrm-external-url-domain-whitelist.5008/

Control which domains are allowed to be used as external resource download/purchase URLs

Features:

• Checking resource download/purchase external URLs for whitelisted domains match
• Integer permission to split lists by user groups