Netty WIP

Implementing ByteBuf backed In/OutPacket first in a separate branch

src/main/java/net/netty/InvalidPacketHeaderException.java

@@ -0,0 +1,14 @@
+package net.netty;
+
+public class InvalidPacketHeaderException extends RuntimeException {
+    private final int header;
+
+    public InvalidPacketHeaderException(String message, int header) {
+        super(message);
+        this.header = header;
+    }
+
+    public int getHeader() {
+        return header;
+    }
+}