Revert "Netty"

This reverts commit 8329061ffd377ffc316e2a381f5457fd02e172c5.

Conflicts:
	pom.xml
	src/main/java/org/spigotmc/netty/CipherCodec.java
	src/main/java/org/spigotmc/netty/NettyNetworkManager.java
NIOM - NIO Manager

Alternative to Netty
improve the existing network manager using Blocking NIO instead of IO (more effecient code)
Writes use a direct memory buffer for zero copy writes, more stable memory usage.

Reimplement Low Priority Queue
Optimized PacketQueue System that supports instant send notification to the writer thread
Removed packet queue walking since it will very unlikely ever be hit now.
Writer thread will now sleep longer until notified
Network threads are no longer interrupted every tick, letting them sleep as much as possible

Conflicts:
	src/main/java/net/minecraft/server/DedicatedServer.java
Changes for NIOM
Signed-off-by: Steven Downer <Grinch@outlook.com>