[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/CNLoginServer.hpp

@@ -0,0 +1,54 @@
+#pragma once
+
+#include "core/Core.hpp"
+#include "Player.hpp"
+
+#include <map>
+
+struct CNLoginData {
+    int userID;
+    time_t lastHeartbeat;
+};
+
+enum class LoginError {
+    DATABASE_ERROR = 0,
+    ID_DOESNT_EXIST = 1,
+    ID_AND_PASSWORD_DO_NOT_MATCH = 2,
+    ID_ALREADY_IN_USE = 3,
+    LOGIN_ERROR = 4,
+    CLIENT_VERSION_OUTDATED = 6,
+    YOU_ARE_NOT_AN_AUTHORIZED_BETA_TESTER = 7,
+    AUTHENTICATION_CONNECTION_ERROR = 8,
+    UPDATED_EUALA_REQUIRED = 9
+};
+
+// WARNING: THERE CAN ONLY BE ONE OF THESE SERVERS AT A TIME!!!!!! TODO: change loginSessions & packet handlers to be non-static
+class CNLoginServer : public CNServer {
+private:
+    static void handlePacket(CNSocket* sock, CNPacketData* data);
+    static std::map<CNSocket*, CNLoginData> loginSessions;
+
+    static void login(CNSocket* sock, CNPacketData* data);
+    static void nameCheck(CNSocket* sock, CNPacketData* data);
+    static void nameSave(CNSocket* sock, CNPacketData* data);
+    static void characterCreate(CNSocket* sock, CNPacketData* data);
+    static void characterDelete(CNSocket* sock, CNPacketData* data);
+    static void characterSelect(CNSocket* sock, CNPacketData* data);
+    static void finishTutorial(CNSocket* sock, CNPacketData* data);
+    static void changeName(CNSocket* sock, CNPacketData* data);
+    static void duplicateExit(CNSocket* sock, CNPacketData* data);
+
+    static bool isLoginDataGood(std::string login, std::string password);
+    static bool isPasswordCorrect(std::string actualPassword, std::string tryPassword);
+    static bool isAccountInUse(int accountId);
+    static bool isCharacterNameGood(std::string Firstname, std::string Lastname);
+    static void newAccount(CNSocket* sock, std::string userLogin, std::string userPassword, int32_t clientVerC);
+    // returns true if success
+    static bool exitDuplicate(int accountId);
+public:
+    CNLoginServer(uint16_t p);
+
+    void newConnection(CNSocket* cns);
+    void killConnection(CNSocket* cns);
+    void onStep();
+};