Create "Scripts to Clipboard" feature (RM #1032)

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Issue migrated from Redmine: https://redmine.postgresql.org/issues/1032
Originally created by André Vale at 2016-03-08 00:10:29 UTC.

I would be very nice to have a feature that works like the existing "Scripts -> CRUD ..." context menu in the object browser.

Instead of openning a new window it would copy the source to the clipboard.