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

squashfs-root/usr/share/icons/Adwaita/symbolic/legacy/preferences-desktop-screensaver-symbolic.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><g fill="#474747"><path d="M12.109 5c.62.75.995 1.71.995 2.76a4.344 4.344 0 01-4.344 4.344c-1.05 0-2.01-.376-2.76-.995A5.055 5.055 0 0010.932 15 5.068 5.068 0 0016 9.932 5.055 5.055 0 0012.109 5zM6.511 1.79c.4 0 .721.322.721.721a.72.72 0 01-.72.721.72.72 0 01-.722-.72c0-.4.322-.722.721-.722zm4 1.023a.697.697 0 110 1.398.697.697 0 01-.699-.7c0-.387.312-.698.7-.698zm-3 1.977c.4 0 .721.322.721.721a.72.72 0 01-.72.721.72.72 0 01-.722-.72c0-.4.322-.722.721-.722z" style="marker:none" color="#bebebe" overflow="visible"/><path d="M3.505 7.505L2.76 5.25.505 4.505 2.76 3.76l.745-2.255.745 2.255 2.255.745-2.255.745z" style="marker:none" color="#000" overflow="visible"/></g></svg>