Added an icon for VertexLight2DEnvironment.

modules/vertex_lights_2d/icons/icon_vertex_light_2d_environment.svg

@@ -0,0 +1,90 @@
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+<svg
+   height="16"
+   viewBox="0 0 16 16"
+   width="16"
+   version="1.1"
+   id="svg4"
+   sodipodi:docname="icon_vertex_light_2d_environment.svg"
+   inkscape:version="1.3.2 (091e20ef0f, 2023-11-25, custom)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs4" />
+  <sodipodi:namedview
+     id="namedview4"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="53"
+     inkscape:cx="8"
+     inkscape:cy="8"
+     inkscape:window-width="1920"
+     inkscape:window-height="1052"
+     inkscape:window-x="1920"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg4" />
+  <g
+     fill="none"
+     stroke="#e0e0e0"
+     id="g4"
+     style="stroke:#a5b7f3;stroke-opacity:0.98823529">
+    <circle
+       cx="8"
+       cy="8"
+       r="6"
+       stroke-linecap="round"
+       stroke-linejoin="round"
+       stroke-width="2"
+       id="circle1"
+       style="stroke:#a5b7f3;stroke-opacity:0.98823529" />
+    <g
+       stroke-width="1.5"
+       transform="translate(0 -1036.4)"
+       id="g3"
+       style="stroke:#a5b7f3;stroke-opacity:0.98823529">
+      <path
+         d="m2 1044.4c4.5932 1.582 8.3985 1.0627 12 0"
+         id="path1"
+         style="stroke:#a5b7f3;stroke-opacity:0.98823529" />
+      <path
+         d="m8 1038.4c-3 4-3 8 0 12"
+         id="path2"
+         style="stroke:#a5b7f3;stroke-opacity:0.98823529" />
+      <path
+         d="m8 1038.4c3 4 3 8 0 12"
+         id="path3"
+         style="stroke:#a5b7f3;stroke-opacity:0.98823529" />
+    </g>
+  </g>
+  <g
+     fill="#ffd684"
+     id="g3-3"
+     transform="rotate(-72.939283,7.7951298,5.6881068)">
+    <ellipse
+       cx="3.7237"
+       cy="3.0267999"
+       rx="2.0114"
+       ry="1.9956"
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+    <ellipse
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+       cy="6.1733999"
+       rx="2.0114"
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+       cy="12.477"
+       rx="2.0114"
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+       id="ellipse3" />
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+</svg>