Implements XCopyableBrowseNode on the ScriptFile class so that all script providers based on the single-file provider can support copying. Change-Id: I14aa057ac432ff80e4a4841fbe5c19be082aa099 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/208161 Tested-by: Jenkins Reviewed-by: Neil Roberts <nroberts@libreoffice.org>