xF2 Add-on [MMO] Core Library 2.2.7

Fix incorrect id in user upgrade option
Add new payment profile option

Add Masks a portion of a string with a repeated character.

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Add helper for html
Add helper Get the first item in the collection, but only if exactly one item exists. Otherwise, throw an exception.
Add helper for Determine if a given string starts with a given substring
Sort collections by key when given a string even when key is callable
Add Uncountable word forms
Adds a few PHP 8.1 related changes

Min php ver 7.3
Provides a trait, when applied to a class, makes it possible to add methods to that class at runtime
Add support for plural phrases
The message supports two different types of pluralization rules:

• interval
• indexed

Use global namespace

Add Pluralization phrases. In the future, it is planned to support conditions in phrases.
Added the ability to create the following options:

• multiple select usergroups
• custom fields: contact, preferences and personal
• multiple select user upgrade

Small refactor
Add helper functions for String and Array