Reload subarg

Added /whitelist reload for manual on-disk changes.

Make the plugin actually work for Bedrock accounts

I changed PreLoginEvent to PostLoginEvent because PreLoginEvent was returning random UUIDs every time a Bedrock account joins. Things should actually work now!

Handle ConsoleCommandSender properly

Fixes the bug where whitelisting people with the console produced an error.

UUID support

First production-ready release!

• The whitelist is stored as UUIDs now so you'll need to repopulate your file.
• The /whitelist command takes UUIDs as well.
• When someone joins who isn't whitelisted you'll get a command suggestion if you have the permission boulder.notify.

Initial barebones release

While this is being rushed out the door, I want to provide this initial functionality because it does technically work.