[Feature Request] Add a "Move Function Declaration to Parent" option for blueprint added functions

Users requested the ability to move only the function declaration to a base class from blueprints instead all of the nodes inside the function. 

From the user: 

"Essentially, 95% of the time what I want to do is take a function in a child, and make it declared on a base class, but with an empty stub in the base and the existing implementation remaining where it is as an override. It's very rare I want to move the implementation, as the intent usually is to reduce dependencies by allowing calls to be made via a reference to the base. Would be awesome if that could be considered."

It may also prove useful to have a way to move functions to the native base class and leave just a stub function, not just with blueprint parent classes. 

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1.Make a BP

2. Create a child BP off of that

3. Add a Function to the child

4. right click on that function

5. "Move function to parent"