Handle First Responder scene objects

[yoiang]

Example:

<!--PMEditProfileVC-->
<scene sceneID="Fap-B1-yVe">
    <objects>
        <viewControllerPlaceholder storyboardName="Settings" referencedIdentifier="PMEditProfileVC" id="pNb-Z8-oMO" sceneMemberID="viewController">
            <navigationItem key="navigationItem" id="CAr-rg-K0G"/>
        </viewControllerPlaceholder>
        <placeholder placeholderIdentifier="IBFirstResponder" id="e7e-IE-MEt" userLabel="First Responder" sceneMemberID="firstResponder"/>
    </objects>
    <point key="canvasLocation" x="1673.5" y="2620"/>
</scene>

Requested by @Antol