[5.3.0] New features

Changelog

• Added new check: NicknameCheck - it uses regular expressions (regex) to validate nicknames.
• Added new command: /guard analyze - you can provide an IP address or nickname, and it will show you details about the user, such as country, city, blacklist/whitelist status, and alt accounts.
• Added nickname whitelist and blacklist. Commands /guard whitelist add/remove and /guard blacklist add/remove now also accepts nicknames. Check your message.yml file if you translated these commands before.
• Fixed many issues with AccountLimitCheck, such as not being able to login with any account after reaching the limit (may still be unstable).
• Added metrics for Velocity version.
• Many minor improvements in the code.

Example of /guard analyze
City and country are unknown because this is a localhost address