Created a new proxy checking system, it will create a new section in your config, called "advanced-proxy-checker". This will be disabled by default (if this setting is disabled, the old proxy checking system will be used, using your key). You can specify as many proxy checking sites as you want. Enabling this will disable the old proxy checking system based on your proxycheck.io key.
Fixed issue with FileNotFoundException on Velocity and some other platforms.
Fixed issue with not enabling on regular BungeeCord (I still prefer using Waterfall).
Deleted not working 'bandwidth-optimizer' because it was causing issues.
The logger is now using java logging util to prevent incompatibilities with different platforms.
Old proxy checker is now using HTTPS instead of HTTP.