Group membership moderators 2.3.0

Require XenForo 2.3+.
Require PHP 8.0+.
Require Standard Library v1.21.0+.
Add password-based confirmation when adding / removing users from a group.
Minor code clean up.

• Only show 'Group Moderators' menu item if the user is a group moderator
• Added multi column layout in ACP for the list of groups

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