SPEC-7531 Change Code/CryEngine to Code/Legacy (#1634)

* git mv Code\CryEngine Code\Legacy
* redirecting CMakeLists.txt
* fixing uic warning
* Some more CryEngine mentions
* validation scripts

Signed-off-by: Esteban Papp <81431996+amznestebanpapp@users.noreply.github.com>

Code/Legacy/CryCommon/MainThreadRenderRequestBus.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) Contributors to the Open 3D Engine Project
+ * 
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ *
+ */
+#pragma once
+
+#include <AzCore/Component/ComponentBus.h>
+#include <AzCore/std/parallel/mutex.h>
+
+namespace AZ
+{
+    /**
+     * Used to queue render commands to be safely executed on the main thread
+     */
+    class MainThreadRenderQueueEvents
+        : public AZ::EBusTraits
+    {
+    public:
+
+        virtual ~MainThreadRenderQueueEvents() {}
+
+        // EBusTraits overrides
+        static const AZ::EBusHandlerPolicy HandlerPolicy = EBusHandlerPolicy::Single;
+        static const bool EnableEventQueue = true;
+        typedef AZStd::mutex EventQueueMutexType;
+    };
+
+    using MainThreadRenderRequestBus = AZ::EBus<MainThreadRenderQueueEvents>;
+}