Add some systemd user units

Mostly for systemd integration of sway stuff.

See: https://github.com/swaywm/sway/wiki/Systemd-integration

systemd/kanshi.service

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+[Unit]
+Description=Dynamic output configuration for Wayland compositors
+Documentation=https://github.com/emersion/kanshi
+BindsTo=sway-session.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/kanshi
+
+[Install]
+WantedBy=sway-session.target

systemd/sway-session.target

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+# See: https://github.com/swaywm/sway/wiki/Systemd-integration
+[Unit]
+Description=sway compositor session
+Documentation=man:systemd.special(7)
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target

systemd/swayidle.service

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+[Unit]
+Description=Idle manager for Wayland
+Documentation=man:swayidle(1)
+BindsTo=sway-session.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/swayidle -w \
+            timeout 300 'swaylock -f -c 000000 \
+                -i /home/aorth/Downloads/3121px-Jerusalem-2013-Temple_Mount-Dome_of_the_Rock-Detail_01.jpg' \
+            timeout 600 'swaymsg "output * dpms off"' \
+                resume 'swaymsg "output * dpms on"' \
+            before-sleep 'swaylock -f -c 000000 \
+                -i /home/aorth/Downloads/3121px-Jerusalem-2013-Temple_Mount-Dome_of_the_Rock-Detail_01.jpg'
+
+[Install]
+WantedBy=sway-session.target

systemd/wob.service

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+[Unit]
+Description=A lightweight overlay volume/backlight/progress/anything bar for Wayland
+Documentation=man:wob(1)
+BindsTo=sway-session.target
+ConditionEnvironment=WAYLAND_DISPLAY
+
+[Service]
+StandardInput=socket
+ExecStart=/usr/bin/wob
+
+[Install]
+WantedBy=sway-session.target

systemd/wob.socket

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+[Socket]
+ListenFIFO=%t/wob.sock
+SocketMode=0600
+
+[Install]
+WantedBy=sockets.target