Remove legacy serialization and QPropertyTree (#684)

Remove:
- CryCommon/CryExtension/*
- CryCommon/Serialization/*
- Sandbox/Plugins/EditorCommon/QPropertyTree/*
- All related CryCommon interfaces
- All CrySystem implementations
- Various related Editor classes

Code/CryEngine/CryCommon/platform_impl.cpp

@@ -14,8 +14,7 @@
 #include <platform.h>
 #include <StringUtils.h>
 #include <ISystem.h>
-#include <CryExtension/Impl/RegFactoryNode.h>
-#include <CryExtension/Impl/ICryFactoryRegistryImpl.h>
+#include <Random.h>
 #include <UnicodeFunctions.h>
 #include <IConsole.h>
 
@@ -42,9 +41,6 @@ SC_API struct SSystemGlobalEnvironment* gEnv = nullptr;
     #include AZ_RESTRICTED_FILE(platform_impl_h)
 #endif
 
-//The reg factory is used for registering the different modules along the whole project
-struct SRegFactoryNode* g_pHeadToRegFactories = 0;
-
 //////////////////////////////////////////////////////////////////////////
 // If not in static library.
 #include <CryThreadImpl.h>
@@ -106,16 +102,6 @@ extern "C" AZ_DLL_EXPORT void ModuleInitISystem(ISystem* pSystem, [[maybe_unused
             AZ::AllocatorManager::Instance();  // Force the AllocatorManager to instantiate and register any allocators defined in data sections
         }
         AZ::Debug::ProfileModuleInit();
-
-#if !defined(AZ_MONOLITHIC_BUILD)
-        ICryFactoryRegistryImpl* pCryFactoryImpl = static_cast<ICryFactoryRegistryImpl*>(pSystem->GetCryFactoryRegistry());
-        if (pCryFactoryImpl)
-        {
-            pCryFactoryImpl->RegisterFactories(g_pHeadToRegFactories);
-        }
-
-        AZ_Error("System", pCryFactoryImpl, "Failed to successfully load factory for %s.  You may have a missing or stale DLL that needs to be recompiled.", moduleName);
-#endif
     } // if pSystem
 }