Red code legacy MemoryManager, StreamEngine, ResourceManager, ImageHandler, AsyncPakManager, and more (#758)

Remove from CryCommon and CrySystem:
- MemoryManager and all related classes/files
- StreamEngine, ResourceManager, ImageHandler, and AsyncPakManager
- Various other related interfaces/files/classes etc. that are all now unused

Code/CryEngine/CrySystem/DllMain.cpp

@@ -62,46 +62,6 @@ AZ_POP_DISABLE_WARNING
 }
 #endif
 
-//////////////////////////////////////////////////////////////////////////
-struct CSystemEventListner_System
-    : public ISystemEventListener
-{
-public:
-    virtual void OnSystemEvent(ESystemEvent event, [[maybe_unused]] UINT_PTR wparam, [[maybe_unused]] UINT_PTR lparam)
-    {
-        switch (event)
-        {
-        case ESYSTEM_EVENT_LEVEL_LOAD_START:
-        case ESYSTEM_EVENT_LEVEL_LOAD_END:
-        {
-            CryCleanup();
-            break;
-        }
-
-        case ESYSTEM_EVENT_LEVEL_POST_UNLOAD:
-        {
-            CryCleanup();
-            STLALLOCATOR_CLEANUP;
-            break;
-        }
-        }
-    }
-};
-
-static CSystemEventListner_System g_system_event_listener_system;
-
-static AZ::EnvironmentVariable<IMemoryManager*> s_cryMemoryManager;
-
-
-// Force the CryMemoryManager into the AZ::Environment for exposure to other DLLs
-void ExportCryMemoryManager()
-{
-    IMemoryManager* cryMemoryManager = nullptr;
-    CryGetIMemoryManagerInterface((void**)&cryMemoryManager);
-    AZ_Assert(cryMemoryManager, "Unable to resolve CryMemoryManager");
-    s_cryMemoryManager = AZ::Environment::CreateVariable<IMemoryManager*>("CryIMemoryManagerInterface", cryMemoryManager);
-}
-
 extern "C"
 {
 CRYSYSTEM_API ISystem* CreateSystemInterface(const SSystemInitParams& startupParams)
@@ -113,8 +73,6 @@ CRYSYSTEM_API ISystem* CreateSystemInterface(const SSystemInitParams& startupPar
     // Environment should have been attached via InjectEnvironment
     AZ_Assert(AZ::Environment::IsReady(), "Environment is not attached, must be attached before CreateSystemInterface can be called");
 
-    ExportCryMemoryManager();
-
     pSystem = new CSystem(startupParams.pSharedEnvironment);
     ModuleInitISystem(pSystem, "CrySystem");
 
@@ -146,8 +104,6 @@ CRYSYSTEM_API ISystem* CreateSystemInterface(const SSystemInitParams& startupPar
         return 0;
     }
 
-    pSystem->GetISystemEventDispatcher()->RegisterListener(&g_system_event_listener_system);
-
     return pSystem;
 }
 };