fdo#67350 : sanity check utility for help ids wrt ui files

Change-Id: I2407d7b0ccdc592fde3da073a6ee2d40537fbe5f
Reviewed-on: https://gerrit.libreoffice.org/9089
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>