Backed - Switch to UUID and XUID instead of EasyWL

[maxonary]

Currently, we're using the EasyWhitelist Plugin to manage users on the server. But switching to the Vanilla Services allows for more secure account validation and no further plugins to be installed.

An issue is finding out the XUID of Bedrock players who haven't logged into a Floodgate server before. There is a website that finds the equivalent of the Xbox Gamertags and XUID:
https://www.cxkes.me/xbox/xuid

Unfortunately, there's no API, so we have to use services like npm Cheerio to build our own service on top of the Frontend:
https://www.npmjs.com/package/cheerio

[maxonary]

Successfully converted https://www.cxkes.me/xbox/xuid

Unfortunately, there is an IP rate throttling.