Add SCOPE_EXIT macro and use it in prefab tests to cleanup assets on test fail

Source/Engine/Core/ScopeExit.h

@@ -0,0 +1,36 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Core.h"
+
+template<typename FuncType>
+struct ScopeExit
+{
+    explicit ScopeExit(FuncType&& func)
+        : _func((FuncType&&)func)
+    {
+    }
+
+    ~ScopeExit()
+    {
+        _func();
+    }
+
+private:
+    FuncType _func;
+};
+
+namespace THelpers
+{
+    struct ScopeExitInternal
+    {
+        template<typename FuncType>
+        ScopeExit<FuncType> operator*(FuncType&& func)
+        {
+            return ScopeExit<FuncType>((FuncType&&)func);
+        }
+    };
+}
+
+#define SCOPE_EXIT const auto CONCAT_MACROS(__scopeExit, __LINE__) = THelpers::ScopeExitInternal() * [&]()