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

squashfs-root/usr/share/icons/Adwaita/symbolic/actions/media-skip-backward-symbolic.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg height="16px" viewBox="0 0 16 16" width="16px" xmlns="http://www.w3.org/2000/svg">
+    <g fill="#2e3436">
+        <path d="m 15 3 v 10 c 0 1 -1.085938 1 -1.085938 1 h -0.113281 c -0.210937 0 -0.417969 -0.046875 -0.601562 -0.148438 l -8.398438 -4.800781 c -0.375 -0.207031 -0.5625 -0.628906 -0.5625 -1.050781 s 0.1875 -0.84375 0.5625 -1.050781 l 8.398438 -4.800781 c 0.183593 -0.101563 0.390625 -0.148438 0.601562 -0.148438 h 0.113281 s 1.085938 0 1.085938 1 z m 0 0"/>
+        <path d="m 1.5 2 h 1 c 0.277344 0 0.5 0.222656 0.5 0.5 v 11 c 0 0.277344 -0.222656 0.5 -0.5 0.5 h -1 c -0.277344 0 -0.5 -0.222656 -0.5 -0.5 v -11 c 0 -0.277344 0.222656 -0.5 0.5 -0.5 z m 0 0"/>
+    </g>
+</svg>