AdvancedServerList

The UpdateChecker has received some improvements to hopefully help in fixing lag and slowdowns in case the Modrinth API is down or struggling.
The HTTPClient used now times out after 5 seconds of no response. In addition is the message players receive on join (if they have permissions) done inside a CompletableFuture's whenComplete(...) method, meaning the sending of the message is done outside the main thread itself, which should help reducing the load on the main thread.