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

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

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg height="16px" viewBox="0 0 16 16" width="16px" xmlns="http://www.w3.org/2000/svg">
+    <path d="m 6.585938 1.585938 l -4 4 c -0.371094 0.378906 -0.578126 0.886718 -0.582032 1.148437 l -0.003906 1.265625 c 0 1 1 1 1 1 h 10 s 1 0 1 -1 v -1 h -0.003906 c 0 -0.53125 -0.207032 -1.039062 -0.582032 -1.414062 l -4 -4 c -0.375 -0.375 -0.8125 -0.617188 -1.414062 -0.585938 s -1.09375 0.265625 -1.414062 0.585938 z m -3.585938 9.414062 c -0.554688 0 -1 0.445312 -1 1 v 1 c 0 0.554688 0.445312 1 1 1 h 10 c 0.554688 0 1 -0.445312 1 -1 v -1 c 0 -0.554688 -0.445312 -1 -1 -1 z m 0 0" fill="#2e3436"/>
+</svg>