feat(Core/Packets): Port packet handling from TrinityCore (#5617)

* feat(Core/Packets): Port packet handling from TrinityCore

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* #3670

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* codestyle

* fix msvc warnings

src/server/game/World/World.cpp

@@ -1978,6 +1978,9 @@ void World::SetInitialWorldSettings()
     // Delete all custom channels which haven't been used for PreserveCustomChannelDuration days.
     Channel::CleanOldChannelsInDB();
 
+    LOG_INFO("server.loading", "Initializing Opcodes...");
+    opcodeTable.Initialize();
+
     LOG_INFO("server", "Starting Arena Season...");
     LOG_INFO("server", " ");
     sGameEventMgr->StartArenaSeason();