[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/Vendor.cpp

@@ -1,8 +1,10 @@
 #include "Vendor.hpp"
 
+using namespace Vendor;
+
 std::map<int32_t, std::vector<VendorListing>> Vendor::VendorTables;
 
-void Vendor::vendorBuy(CNSocket* sock, CNPacketData* data) {
+static void vendorBuy(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_VENDOR_ITEM_BUY))
         return; // malformed packet
 
@@ -57,7 +59,7 @@ void Vendor::vendorBuy(CNSocket* sock, CNPacketData* data) {
     sock->sendPacket((void*)&resp, P_FE2CL_REP_PC_VENDOR_ITEM_BUY_SUCC, sizeof(sP_FE2CL_REP_PC_VENDOR_ITEM_BUY_SUCC));
 }
 
-void Vendor::vendorSell(CNSocket* sock, CNPacketData* data) {
+static void vendorSell(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_VENDOR_ITEM_SELL))
         return; // malformed packet
 
@@ -123,7 +125,7 @@ void Vendor::vendorSell(CNSocket* sock, CNPacketData* data) {
     sock->sendPacket((void*)&resp, P_FE2CL_REP_PC_VENDOR_ITEM_SELL_SUCC, sizeof(sP_FE2CL_REP_PC_VENDOR_ITEM_SELL_SUCC));
 }
 
-void Vendor::vendorBuyback(CNSocket* sock, CNPacketData* data) {
+static void vendorBuyback(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_VENDOR_ITEM_RESTORE_BUY))
         return; // malformed packet
 
@@ -202,7 +204,7 @@ void Vendor::vendorBuyback(CNSocket* sock, CNPacketData* data) {
     sock->sendPacket((void*)&resp, P_FE2CL_REP_PC_VENDOR_ITEM_RESTORE_BUY_SUCC, sizeof(sP_FE2CL_REP_PC_VENDOR_ITEM_RESTORE_BUY_SUCC));
 }
 
-void Vendor::vendorTable(CNSocket* sock, CNPacketData* data) {
+static void vendorTable(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_VENDOR_TABLE_UPDATE))
         return; // malformed packet
 
@@ -234,7 +236,7 @@ void Vendor::vendorTable(CNSocket* sock, CNPacketData* data) {
     sock->sendPacket((void*)&resp, P_FE2CL_REP_PC_VENDOR_TABLE_UPDATE_SUCC, sizeof(sP_FE2CL_REP_PC_VENDOR_TABLE_UPDATE_SUCC));
 }
 
-void Vendor::vendorStart(CNSocket* sock, CNPacketData* data) {
+static void vendorStart(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_VENDOR_START))
         return; // malformed packet
 
@@ -247,7 +249,7 @@ void Vendor::vendorStart(CNSocket* sock, CNPacketData* data) {
     sock->sendPacket((void*)&resp, P_FE2CL_REP_PC_VENDOR_START_SUCC, sizeof(sP_FE2CL_REP_PC_VENDOR_START_SUCC));
 }
 
-void Vendor::vendorBuyBattery(CNSocket* sock, CNPacketData* data) {
+static void vendorBuyBattery(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_VENDOR_BATTERY_BUY))
         return; // malformed packet
 
@@ -284,7 +286,7 @@ void Vendor::vendorBuyBattery(CNSocket* sock, CNPacketData* data) {
     sock->sendPacket((void*)&resp, P_FE2CL_REP_PC_VENDOR_BATTERY_BUY_SUCC, sizeof(sP_FE2CL_REP_PC_VENDOR_BATTERY_BUY_SUCC));
 }
 
-void vendorCombineItems(CNSocket* sock, CNPacketData* data) {
+static void vendorCombineItems(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_ITEM_COMBINATION))
         return; // malformed packet