Move "Copy to Clipboard" action to a nice visible button

Merged Nate Graham requested to merge ngraham/kinfocenter:make-copy-action-visible into master

Right now it's possible to copy the text on a page that's based on CommandOutputKCM, but this is hidden because the action only lives in a context menu when you right-click on the view.

This commit fixes that by moving the action to a nice big visually obvious button on the footer. This should make the action discoverable--enough that we can remove the single-item context menu that previously held the action.


@teams/usability @teams/vdg @sitter

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