Adds copy and paste buttons to the Macro Manager dialog so that script files can be copied with script providers that support the XCopyableBrowseNode interface. The “copy” button selects the file to be copied and then the “paste” button works when a destination is selected. Change-Id: I058b7ed53c837d17723b5f1b4e69f0bc7ae2594f Reviewed-on: https://gerrit.libreoffice.org/c/core/+/207738 Tested-by: Jenkins Reviewed-by: Neil Roberts <nroberts@libreoffice.org>