Fix using Delegate<> in API event

(cherry picked from commit 7b2c034fba)

Source/Engine/Core/Delegate.h

@@ -4,11 +4,6 @@
 
 #include "Engine/Core/Memory/Allocation.h"
 
-template<typename>
-class Function;
-template<typename... Params>
-class Delegate;
-
 /// <summary>
 /// The function object.
 /// </summary>

Source/Engine/Core/Types/BaseTypes.h

@@ -97,6 +97,10 @@ template<typename T, typename U>
 class Pair;
 template<typename KeyType, typename ValueType>
 class Dictionary;
+template<typename>
+class Function;
+template<typename... Params>
+class Delegate;
 
 // Declares full set of operators for the enum type (using binary operation on integer values)
 #define DECLARE_ENUM_OPERATORS(T) \