Revert changes made to UUIDFetcher

[thomasmny]

If the server is behind a proxy & the player is offline which a UUID fetch is made, a different one will be returned than if the player were to be online.

Thus, the UUIDFetcher should behave differently for offline servers and online/proxy servers

[thomasmny]

@Lumine1909 Can you try this version and see if it works for you? It seems that #300 caused some issues with servers behind Velocity if:

1. PlayerA is offline
2. PlayerB adds PlayerA to the builder of a world
3. PlayerA joins the server

[Lumine1909]

@Lumine1909 Can you try this version and see if it works for you? It seems that #300 caused some issues with servers behind Velocity if:

1. PlayerA is offline
2. PlayerB adds PlayerA to the builder of a world
3. PlayerA joins the server

Has player A ever joined to the server?

[DeadlyCinder]

So what happened to me was:

I tried to remove a player as builder from my world. Although the chat message said it was done the GUI and the config file didnt change. Then i tried adding a player as builder, but the plugin pulled the wrong uuid because the player was offline. When he was online it worked.

After getting this Snapshot Version the issue was fixed

[Lumine1909]

This will still causing some issues when working with Offline proxy mode
Please check #335