Initial Netty implementation for networking

Split into 1 LoginServer and 1 ChannelServer per channel.

There is still a lot of cleanup and refactoring to be done.
Currently, the reliance on IoSession holding client state
is the most pressing issue to be addressed.

src/main/java/net/netty/ServerChannelInitializer.java

@@ -0,0 +1,22 @@
+package net.netty;
+
+import client.MapleClient;
+import constants.net.ServerConstants;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.socket.SocketChannel;
+import tools.MaplePacketCreator;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+public abstract class ServerChannelInitializer extends ChannelInitializer<SocketChannel> {
+    static final AtomicLong sessionId = new AtomicLong(7777);
+
+    void initPipeline(SocketChannel socketChannel, MapleClient client) {
+        final InitializationVector sendIv = InitializationVector.generateSend();
+        final InitializationVector recvIv = InitializationVector.generateReceive();
+        socketChannel.writeAndFlush(Unpooled.wrappedBuffer(MaplePacketCreator.getHello(ServerConstants.VERSION, sendIv, recvIv)));
+        socketChannel.pipeline().addLast("PacketCodec", new PacketCodec(ClientCyphers.of(sendIv, recvIv)));
+        socketChannel.pipeline().addLast("MapleClient", client);
+    }
+}