Export to paste buffer about zui

[philrz]

Verified in Zui commit 1365bbd.

As shown in the attached video, clicking Export now offers a Copy to Clipboard button that's an alternative to the export-to-file we've always had and the new export-to-pool option that was also added. What's shown here is export in TSV format for immediate paste into a spreadsheet tool such as the community user originally requested. There's also a keyboard shortcut for bringing up Export, a keyboard shortcut for selecting the Copy to Clipboard option, and Esc can always be hit to dismiss the Export modal, so if users are doing frequent exports to the paste buffer this also offers them a keyboard-centric approach.

Verify.mp4

Thanks @jameskerr!