[refactor] Mark all internal functions static

All packet handlers and helper functions that are only used in the
source file they're declared in have been taken out of the namespaces in
the corresponding header files, have been marked static, and have been
reordered to avoid the need for declarations at the top of each source
file.

Each source file now contains a "using namespace" directive so that the
static functions don't need to prefix the source file's symbols with
their namespace. All redundant namespace prefixes found have been
removed.

An unused nano power resetting function in NanoManager has been removed.

src/BuddyManager.hpp

@@ -3,39 +3,11 @@
 #include "Player.hpp"
 #include "CNProtocol.hpp"
 #include "CNStructs.hpp"
-#include "CNShardServer.hpp"
-
-#include <map>
-#include <list>
+#include "CNProtocol.hpp"
 
 namespace BuddyManager {
 	void init();
 
 	// Buddy list
 	void refreshBuddyList(CNSocket* sock);
-
-	// Buddy requests
-	void requestBuddy(CNSocket* sock, CNPacketData* data);
-	void reqBuddyByName(CNSocket* sock, CNPacketData* data);
-
-	// Buddy accepting
-	void reqAcceptBuddy(CNSocket* sock, CNPacketData* data);
-	void reqFindNameBuddyAccept(CNSocket* sock, CNPacketData* data);
-
-	// Getting buddy state
-	void reqPktGetBuddyState(CNSocket* sock, CNPacketData* data);
-
-	// Blocking/removing buddies
-	void reqBuddyBlock(CNSocket* sock, CNPacketData* data);
-	void reqPlayerBlock(CNSocket* sock, CNPacketData* data);
-	void reqBuddyDelete(CNSocket* sock, CNPacketData* data);
-
-	// Buddy warping
-	void reqBuddyWarp(CNSocket* sock, CNPacketData* data);
-
-	// helper methods
-	
-	// Name checks
-	int getAvailableBuddySlot(Player* plr);
-	bool playerHasBuddyWithID(Player* plr, int buddyID);
 }