Rearranged the codebase a little.

* Deleted empty Player.cpp
* Moved the helper functions from the obsolete CNStructs.cpp into
main.cpp and deleted it
* Renamed CombatManager to MobManager, as that will likely become it's
main focus soon

src/MobManager.hpp

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "CNProtocol.hpp"
+#include "CNShared.hpp"
+#include "CNShardServer.hpp"
+
+namespace MobManager {
+    void init();
+
+    void pcAttackNpcs(CNSocket *sock, CNPacketData *data);
+    void combatBegin(CNSocket *sock, CNPacketData *data);
+    void combatEnd(CNSocket *sock, CNPacketData *data);
+    void dotDamageOnOff(CNSocket *sock, CNPacketData *data);
+
+    void giveReward(CNSocket *sock);
+}