Move some logic out of RevisionGrid to new class RevisionGridClasses/CopyToClipboardUtil.cs
Copy to clipboard menu: do not cascade branche names
rename class
Copy to clipboard menu: do not cascade tag names
Merge remote-tracking branch 'gitextensions/master' into change/copy_to_clipboard_menu
Merge pull request #1973 from feinstaub/change/copy_to_clipboard_menu

RevisionGrid -> "copy to clipboard" menu: do not cascade branch and tag names