Instead of using XInvocation and XPropertySet to expose the optional create and edit methods, the script providers based on singleprov now use the new concrete interfaces XCreatableBrowseNode and XEditableBrowseNode. Change-Id: Iae966e554f436b8708699c7d86311f165db2d19f Reviewed-on: https://gerrit.libreoffice.org/c/core/+/207347 Tested-by: Jenkins Reviewed-by: Neil Roberts <nroberts@libreoffice.org>