Split up the serial code, but had to gut it in the process

Since the contents of the packets are different than before, I decided to
gut the serialization code. I'll reimplement the internals soon.

common/network/serial/serial_combat.cpp

@@ -0,0 +1,36 @@
+/* Copyright: (c) Kayne Ruse 2014
+ * 
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ * 
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ * 
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 
+ * 3. This notice may not be removed or altered from any source
+ * distribution.
+*/
+#include "serial.hpp"
+
+#include "serial_util.hpp"
+
+void serializeCombat(CombatPacket* packet, void* buffer) {
+	SERIALIZE(buffer, &packet->type, sizeof(SerialPacketType));
+
+	//TODO
+}
+
+void deserializeCombat(CombatPacket* packet, void* buffer) {
+	DESERIALIZE(buffer, &packet->type, sizeof(SerialPacketType));
+
+	//TODO
+}