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/ChannelServerInitializer.java

@@ -0,0 +1,31 @@
+package net.netty;
+
+import client.MapleClient;
+import io.netty.channel.socket.SocketChannel;
+import net.PacketProcessor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ChannelServerInitializer extends ServerChannelInitializer {
+    private static final Logger log = LoggerFactory.getLogger(ChannelServerInitializer.class);
+
+    private final int world;
+    private final int channel;
+
+    public ChannelServerInitializer(int world, int channel) {
+        this.world = world;
+        this.channel = channel;
+    }
+
+    @Override
+    public void initChannel(SocketChannel socketChannel) {
+        final String clientIp = socketChannel.remoteAddress().getHostName();
+        log.debug("Client connected to world {}, channel {} from {}", world, channel, clientIp);
+
+        PacketProcessor packetProcessor = PacketProcessor.getChannelServerProcessor(world, channel);
+        final MapleClient client = new MapleClient(packetProcessor, world, channel);
+        client.setSessionId(sessionId.getAndIncrement());
+
+        initPipeline(socketChannel, client);
+    }
+}