execute inpin function

This can be used to dynamically call functions (for example from the frontend)

Executes the function whose reference arrives on the inpinfunction pin (an object carrying action_guid), enabling dynamic dispatch e.g. from the frontend. Pin values pass into the function and its return values map back onto this block's outputs; data embedded in the function reference wins over same-named pin values. A missing or non-object reference, an empty action_guid, and a failed call are all SILENT : no error output, the flow just continues.