[XB] Avatar Log: Avatar History & Previous Avatars 1.1.1

• Added previous avatar selection in the standard avatar editor, with a separate permission and configurable display limit
• Added restoration of historical avatars from the ACP log
• Added filters for log ID, user ID, and stored avatar size
• Added lightbox previews and stored-size information to the log
• Added optional preservation of the original avatar image
• Stored new avatar log files with a unique log ID to avoid filename collisions

• Added user change log page support
• Added public interface for moderators to view avatar log from member profile page