fix(respondable): ignore reflected messages from iframes #2134
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The code wasn't ignoring errant iframes from responding to our post messages with data we weren't expecting or to reflected messages. So to ensure we ignored these messages I assigned a unique id to each axe instance. When we receive a message we look to make sure the messages came from a different axe instance than the one listening to the event. That way we are guaranteed to only respond to messages sent from an axe instance inside an iframe.
Closes issue: #2127
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