Integrate dmenu as a preloaded zero-lag DWM plugin (dmenu.so)

overlay/rootfs/usr/bin/sxmo_appmenu.sh

@@ -2,6 +2,16 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 # Copyright 2022 Sxmo Contributors
 
+if [ "${1:-}" = "--fallback" ]; then
+	shift
+elif [ -p /tmp/dwm_plugin_dmenu.fifo ]; then
+	case "${1:-}" in
+		""|sys|applications|scripts|modem|config|power|sthotkeys)
+			exec dmenu "${1:-ctx}"
+			;;
+	esac
+fi
+
 # include common definitions
 # shellcheck source=configs/default_hooks/sxmo_hook_icons.sh
 . sxmo_hook_icons.sh