Show nicer card/app labels for the card/app tabs

Card, PIVCard:

• Add display serial number to the base class Card

ReaderStatus:

• Try to get the display serial number from scdaemon for all supported cards/card applications

PIVCardWidget:

• Show only the display serial number; the full serial number is available as tooltip

SmartCardWidget:

• Use display serial number and nicer app names for the labels of the card application tabs

• GnuPG-bug-id: T5066