data: Split user and system data files into respective directories, add user D-Bus unit

data/system/com.steampowered.SteamOSManager1.conf

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!DOCTYPE busconfig PUBLIC
+ "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+<busconfig>
+  <!-- Only root can own the service -->
+  <policy user="root">
+    <allow own="com.steampowered.SteamOSManager1"/>
+  </policy>
+
+  <!-- Anyone can send messages to the service -->
+  <policy context="default">
+    <allow send_destination="com.steampowered.SteamOSManager1"/>
+  </policy>
+</busconfig>

data/system/com.steampowered.SteamOSManager1.service

@@ -0,0 +1,5 @@
+[D-BUS Service]
+Name=com.steampowered.SteamOSManager1
+Exec=/usr/lib/steamos-manager -r
+User=root
+SystemdService=steamos-manager.service

data/system/steamos-manager.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=SteamOS Manager Daemon
+Wants=steamos-log-submitter.service
+After=steamos-log-submitter.service
+
+[Service]
+Type=dbus
+BusName=com.steampowered.SteamOSManager1
+Environment=RUST_LOG='INFO'
+ExecStart=/usr/lib/steamos-manager -r
+Restart=on-failure
+RestartSec=1
+
+[Install]
+WantedBy=multi-user.target