Add Serial Number to Preferences -> Columns to Display

[cconard]

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Add option to display certificate Serial Number to "Columns to Display". My workplace uses serial numbers to identify certificates. While I can see the certificate's serial number in the detailed view, I'd like an option to see it in the main Explorer view.

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There are other identifiers available, however, my workplace uses Serial Number.

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[kaikramer]

Sounds reasonable, I'll add it to the list for KSE 5.5

[kaikramer]

Closing tickets in preparation for release of KSE 5.5.0