Add unified Xresources theme engine, Default.xth export, and xthemes manager plugin

overlay/rootfs/usr/bin/sxmo_appmenu.sh

@@ -173,6 +173,7 @@ ${_flash_line}$icon_net Networks^0^sxmo_networks.sh
 $icon_mus Audio^0^sxmo_audio.sh
 $icon_phn Modem^0^sxmo_appmenu.sh modem
 $icon_win Windows^0^sxmo_wmmenu.sh
+$icon_cfg Themes^0^xthemes
 $icon_cfg Config^0^sxmo_appmenu.sh config
 $icon_pwr Power^0^sxmo_appmenu.sh power"
 }
@@ -220,7 +221,8 @@ $icon_phl Modem Log^0^sxmo_modemlog.sh"
 			[ -e "${XDG_CACHE_HOME:-$HOME/.cache}/sxmo/sxmo.nosuspend" ] && _susp_icon="$icon_tof"
 			_idle_icon="$icon_ton"
 			[ -e "${XDG_CACHE_HOME:-$HOME/.cache}/sxmo/sxmo.noidle" ] && _idle_icon="$icon_tof"
-			CHOICES="$icon_aru Brightness^1^sxmo_brightness.sh up
+			CHOICES="$icon_cfg Themes^0^xthemes
+$icon_aru Brightness^1^sxmo_brightness.sh up
 $icon_ard Brightness^1^sxmo_brightness.sh down
 $icon_cfg Toggle Bar^0^sxmo_wm.sh togglebar
 $icon_bth Bluetooth $_bt_icon^1^doas sxmo_bluetoothtoggle.sh && sxmo_hook_statusbar.sh bluetooth

overlay/rootfs/usr/bin/xthemes

@@ -0,0 +1 @@
+dwm-plugin