Moving client and player data into manager classes

Remember: anything with "manager" in its name organizes a number of other
objects, as far as I'm concerned.

I'll eventually have a database connection in the PlayerManager class;
this'll make it easier to manage the database.

server/client_manager.hpp

@@ -0,0 +1,47 @@
+/* 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.
+*/
+#ifndef CLIENTMANAGER_HPP_
+#define CLIENTMANAGER_HPP_
+
+#include "SDL/SDL_net.h"
+
+#include <map>
+
+struct ClientEntry {
+	IPaddress address;
+};
+
+class ClientManager {
+public:
+	//returns the internal index
+	int HandleConnection(IPaddress);
+	int HandleDisconnection(int i);
+
+	//accessors
+	ClientEntry* GetClient(int i);
+	ClientEntry* GetClient(IPaddress);
+private:
+	std::map<int, ClientEntry> clientMap;
+	int counter = 0;
+};
+
+#endif