Draft: Mpv fullscreen

Solves #2

rsc/icons/breeze-dark/view-fullscreen.svg

+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#eff0f1;
+      }
+      </style>
+  </defs>
+ <path style="fill:currentColor;fill-opacity:1;stroke:none" 
+       d="M 2 2 L 2 5 L 5 2 L 2 2 z M 11 2 L 14 5 L 14 2 L 11 2 z M 4 4 L 4 6.40625 L 4 11.1875 L 4 12 L 12 12 L 12 11.1875 L 12 4 L 4.8125 4 L 4 4 z M 5 6 L 11 6 L 11 11 L 5 11 L 5 6 z M 2 11 L 2 14 L 5 14 L 2 11 z M 14 11 L 11 14 L 14 14 L 14 11 z "
+     class="ColorScheme-Text"
+     />
+</svg>