[refactor] Move files to core/ and servers/ subdirectories

CNProtocol, CNShared, CNStructs and Defines are now in core/.
CNLoginServer, CNShardServer and Monitor are now in servers/.

core/Core.hpp wraps all the core headers except for CNShared.hpp.

Defines.cpp has been renamed to Packets.cpp, and so has its
corresponding namespace, but not the header file. This is in preparation
for upcoming changes.

src/servers/CNShardServer.hpp

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "core/Core.hpp"
+
+#include <map>
+
+#define REGISTER_SHARD_PACKET(pactype, handlr) CNShardServer::ShardPackets[pactype] = handlr;
+#define REGISTER_SHARD_TIMER(handlr, delta) CNShardServer::Timers.push_back(TimerEvent(handlr, delta));
+
+class CNShardServer : public CNServer {
+private:
+    static void handlePacket(CNSocket* sock, CNPacketData* data);
+
+    static void keepAliveTimer(CNServer*, time_t);
+    static void periodicSaveTimer(CNServer* serv, time_t currTime);
+
+public:
+    static std::map<uint32_t, PacketHandler> ShardPackets;
+    static std::list<TimerEvent> Timers;
+
+    CNShardServer(uint16_t p);
+
+    static void _killConnection(CNSocket *cns);
+
+    bool checkExtraSockets(int i);
+    void newConnection(CNSocket* cns);
+    void killConnection(CNSocket* cns);
+    void kill();
+    void onStep();
+};