DragonByte Social Groups 2.2.0

Feature: Import forum threads to social groups (#97)
Feature: [OzzModz] Social Groups importer
Change: Use a unique phrase for Group Memberships rebuild jobs
Fix: Media index now respects the "Enable XFMG Integration" setting
Fix: Fix some template macro references
Fix: A section's "Minimum tags" setting was not correctly applied to new discussions
Fix: A missing phrase used in the Featured Content setup has been added
Fix: Fix importing XFMG data
Fix: Rebuild group members after import
Fix: Ensure we only restore the previous album category if it's an "Album" type category
Fix: Ensure album_count is at least 0
Fix: Fix server errors from an incorrect import

This version focuses almost entirely on importing; it's now possible to import forum threads to Social Groups, and you can now import from [OzzModz] Social Groups!
Importing threads to social groups requires both a new permission, as well as the "Copy thread" permission on the source forum(s).

Furthermore, a few bugs and other issues have been resolved.