Improvement #41: Enable/disable redirection through D-Bus

- Add "redirected_force" to D-Bus opts_get to forcefully
  redirect/unredirect windows.

- Add D-Bus method "repaint", to, namely, repaint the screen.

dbus-examples/cdbus-driver.sh

@@ -51,3 +51,13 @@ dbus-send --print-reply --dest="$service" "$object" "${interface}.opts_get" stri
 sleep 3
 dbus-send --print-reply --dest="$service" "$object" "${interface}.reset"
 
+# Undirect window
+sleep 3
+dbus-send --print-reply --dest="$service" "$object" "${interface}.opts_set" string:redirected_force uint16:0
+
+# Revert back to auto
+sleep 3
+dbus-send --print-reply --dest="$service" "$object" "${interface}.opts_set" string:redirected_force uint16:2
+
+# Force repaint
+dbus-send --print-reply --dest="$service" "$object" "${interface}.repaint"