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Bind/Assign Once Blueprint node

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    [FEATURE REQUEST] Bind/Assign Once Blueprint node

    It's quite usual that we have events, that we want to bind only once, like on the attached image: Loading something, waiting for a unique event to happen, etc. In these cases, you'll have to unbind the event just after it has been called - which is just:
    1) Error prone (you might link a wrong unbind event, or you just forget to unbind it completely)
    2) Takes unnecessary graph space

    It would be really great to have a `Bind Once` and an `Assign Once` node, which unbinds the delegate after it has been called.
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