bean: Boolean Parsing

Change-Id: If5e77da2b42b126e2c8fd7613b6adaed635fd683
Reviewed-on: https://gerrit.libreoffice.org/11364
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>