This adds the ability to define the spinbox orientation that has
decrease and increase buttons on the right side and can be changed
by adding "orientation="edit-decrease-increase" to the Spinbox
"Entire" part in the widget definition.

Change-Id: I3601a987a4abb8d998e9cd2d8973d794d3d66f9b
Reviewed-on: https://gerrit.libreoffice.org/72662
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>