feat: add various system and theme icons, configuration files, and support assets

squashfs-root/usr/share/icons/Humanity-Dark/status/16/audio-volume-high-panel.svg

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+<svg id="svg2" width="16" height="16" version="1.0" xmlns="http://www.w3.org/2000/svg">
+ <rect id="rect2384" x="13" y="1" width="2" height="15" rx="0" ry="0" style="fill:#969696"/>
+ <rect id="rect3158" x="10" y="4" width="2" height="9" rx="0" ry="0" style="fill:#969696"/>
+ <rect id="rect3162" x="7" y="7" width="2" height="3" rx="0" ry="0" style="fill:#969696"/>
+ <path id="path2387" d="m0 6v5h2l4 4v-13l-4 4h-2z" style="fill-rule:evenodd;fill:#969696"/>
+</svg>