fdo#74847 add buttons to start and stop pointer

Change-Id: I45c2ab13924df5dae86f71364305dc3444b364d1
Reviewed-on: https://gerrit.libreoffice.org/8541
Reviewed-by: Faisal al-otaibi <fmalotaibi@kacst.edu.sa>
Tested-by: Faisal al-otaibi <fmalotaibi@kacst.edu.sa>
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>