Support mask attribute

[skylerparr]

Given this SVG:

<?xml version="1.0" encoding="UTF-8"?>
<svg width="512px" height="512px" viewBox="0 0 512 512" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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        <rect id="path-9" x="0" y="0" width="240" height="88"></rect>
    </defs>
    <g id="title" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <g id="Title">
            <g id="The" transform="translate(133.500000, 105.000000) rotate(-90.000000) translate(-133.500000, -105.000000) translate(72.000000, 61.000000)">
                <mask id="mask-8" fill="white">
                    <use xlink:href="#path-7"></use>
                </mask>
                <g id="ui/fills/color/base" mask="url(#mask-8)">
                    <mask id="mask-10" fill="white">
                        <use xlink:href="#path-9"></use>
                    </mask>
                    <g id="Background"></g>
                    <g id="ui/atomic/quark/color/neutral-2" mask="url(#mask-10)" fill="#252B2C" fill-rule="evenodd" stroke-width="1">
                        <g id="ui/fills/color/material2/neutral-2">
                            <rect id="Fill" x="0" y="0" width="240" height="88"></rect>
                        </g>
                    </g>
                </g>
            </g>
        </g>
    </g>
</svg>

expected outcome:

got:

running:
haxe 3.4.7
openfl 8.8.0
lime 7.2.1
svg [master]