Revert "Mojang allows multiple status queries in a connection, we should too."

This reverts commit 77f6930280f7dafa86891105c6960c9bc9dcca44.
Added 'ForwardToPlayer' subchannel
Finalize the ServerDisconnectEvent target field.

There is no good reason for it to be mutable in the first place, considering that the event instance is not used after the method is called.
Update Netty and enable Epoll as bugs have been fixed.
Final nail in the coffin for xxx cannot be cast to yyy bug.
Ignore unknown entries in plugin description files.

Fixes #955.
Correct toLegacyText the same way toPlainText was previously
Fix LoginEvent firing after PreLoginEvent is cancelled
Disable epoll by default due to timeouts its causing

 Anyone who wants to continue testing epoll for us may do so with `-Dbungee.epoll=true`