Added footsteps, new tree, various other tweaks

addons/proton_scatter/icons/restrict_volume_lock.svg

@@ -0,0 +1,59 @@
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+   height="16"
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+   xmlns:svg="http://www.w3.org/2000/svg"
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+   xmlns:dc="http://purl.org/dc/elements/1.1/">
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+     bordercolor="#666666"
+     borderopacity="1.0"
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