[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/Email.cpp

@@ -1,7 +1,18 @@
 #include "Email.hpp"
 
+#include "CNProtocol.hpp"
+#include "CNStructs.hpp"
+#include "CNShardServer.hpp"
+
+#include "db/Database.hpp"
+#include "PlayerManager.hpp"
+#include "ItemManager.hpp"
+#include "ChatManager.hpp"
+
+using namespace Email;
+
 // New email notification
-void Email::emailUpdateCheck(CNSocket* sock, CNPacketData* data) {
+static void emailUpdateCheck(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_EMAIL_UPDATE_CHECK))
         return; // malformed packet
 
@@ -11,7 +22,7 @@ void Email::emailUpdateCheck(CNSocket* sock, CNPacketData* data) {
 }
 
 // Retrieve page of emails
-void Email::emailReceivePageList(CNSocket* sock, CNPacketData* data) {
+static void emailReceivePageList(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_RECV_EMAIL_PAGE_LIST))
         return; // malformed packet
 
@@ -41,7 +52,7 @@ void Email::emailReceivePageList(CNSocket* sock, CNPacketData* data) {
 }
 
 // Read individual email
-void Email::emailRead(CNSocket* sock, CNPacketData* data) {
+static void emailRead(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_READ_EMAIL))
         return; // malformed packet
 
@@ -66,7 +77,7 @@ void Email::emailRead(CNSocket* sock, CNPacketData* data) {
 }
 
 // Retrieve attached taros from email
-void Email::emailReceiveTaros(CNSocket* sock, CNPacketData* data) {
+static void emailReceiveTaros(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_RECV_EMAIL_CANDY))
         return; // malformed packet
 
@@ -89,7 +100,7 @@ void Email::emailReceiveTaros(CNSocket* sock, CNPacketData* data) {
 }
 
 // Retrieve individual attached item from email
-void Email::emailReceiveItemSingle(CNSocket* sock, CNPacketData* data) {
+static void emailReceiveItemSingle(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_RECV_EMAIL_ITEM))
         return; // malformed packet
 
@@ -128,7 +139,7 @@ void Email::emailReceiveItemSingle(CNSocket* sock, CNPacketData* data) {
 }
 
 // Retrieve all attached items from email
-void Email::emailReceiveItemAll(CNSocket* sock, CNPacketData* data) {
+static void emailReceiveItemAll(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_RECV_EMAIL_ITEM_ALL))
         return; // malformed packet
 
@@ -173,7 +184,7 @@ void Email::emailReceiveItemAll(CNSocket* sock, CNPacketData* data) {
 }
 
 // Delete an email
-void Email::emailDelete(CNSocket* sock, CNPacketData* data) {
+static void emailDelete(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_DELETE_EMAIL))
         return; // malformed packet
 
@@ -190,7 +201,7 @@ void Email::emailDelete(CNSocket* sock, CNPacketData* data) {
 }
 
 // Send an email
-void Email::emailSend(CNSocket* sock, CNPacketData* data) {
+static void emailSend(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_SEND_EMAIL))
         return; // malformed packet