dbus: expose more functionality

wire-dbus/org.freedesktop.DBus.Properties.txt

@@ -8,3 +8,9 @@ fn Set(interface_name: string, property_name: string, value: variant) {
 fn GetAll(interface_name: string) {
     props: array(dict(string, variant)),
 }
+
+sig PropertiesChanged {
+    interface_name: string,
+    changed_properties: array(dict(string, variant)),
+    invalidated_properties: array(string),
+}

wire-dbus/org.freedesktop.DBus.txt

@@ -7,3 +7,7 @@ fn AddMatch(rule: string) { }
 fn RemoveMatch(rule: string) { }
 
 fn UpdateActivationEnvironment(environment: array(dict(string, string))) { }
+
+fn RequestName(name: string, flags: u32) {
+    rv: u32,
+}