Added footsteps, new tree, various other tweaks

addons/proton_scatter/icons/menu.svg

@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   height="16"
+   viewBox="0 0 16 16"
+   width="16"
+   version="1.1"
+   id="svg4"
+   sodipodi:docname="menu.svg"
+   inkscape:version="1.0.1 (0767f8302a, 2020-10-17)">
+  <metadata
+     id="metadata10">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs8" />
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1416"
+     inkscape:window-height="901"
+     id="namedview6"
+     showgrid="false"
+     inkscape:zoom="22.403449"
+     inkscape:cx="4.2500969"
+     inkscape:cy="5.8093823"
+     inkscape:window-x="36"
+     inkscape:window-y="0"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="layer2" />
+  <g
+     inkscape:groupmode="layer"
+     id="layer2"
+     inkscape:label="Layer 2"
+     style="display:inline">
+    <rect
+       style="fill:#e0e0e0;stroke:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;fill-opacity:1"
+       id="rect835"
+       width="12"
+       height="2"
+       x="2"
+       y="7" />
+    <rect
+       style="fill:#e0e0e0;stroke:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;fill-opacity:1"
+       id="rect835-3"
+       width="12"
+       height="2"
+       x="2.0000005"
+       y="2" />
+    <rect
+       style="fill:#e0e0e0;stroke:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;fill-opacity:1"
+       id="rect835-3-6"
+       width="12"
+       height="2"
+       x="1.9999995"
+       y="12" />
+  </g>
+</svg>