Fix crash during user_defined_conversions_2

Temporaries created during user conversion operations were being dropped
before the result of the conversion was able to be used. This fixes that
by temporarily storing the result of the conversion inside the
current Function_Push_Pop context.

include/chaiscript/dispatchkit/boxed_value.hpp

@@ -67,6 +67,7 @@ namespace chaiscript
         Data &operator=(Data &&rhs) = default;
 #endif
 
+
         Type_Info m_type_info;
         chaiscript::detail::Any m_obj;
         void *m_data_ptr;
@@ -122,6 +123,13 @@ namespace chaiscript
             return get(std::ref(*t));
           }
 
+        template<typename T>
+          static std::shared_ptr<Data> get(const T *t)
+          {
+            return get(std::cref(*t));
+          }
+
+
         template<typename T>
           static std::shared_ptr<Data> get(std::reference_wrapper<T> obj)
           {