Now using the server built in user cache for user identification and tab-completion.

The previous system had a tendency to cause performance issues in large servers. This one should avoid that.

Should now function on 1.14, 1.15, 1.16.

Moved to maven.

PS:
If anyone experiences an issue, don't hesitate to let me know.

Made finding of the player asynchronous to significantly lessen the lagspike it would cause on servers with a large player base.

Now able to look at different pages instead of seeing a wall of text at once.

Fixed minor issue with cancelling. Fixed minor issue displaying payments. A few changes within messages.