Qt: add copyrightLabel to aboutdialog.ui
Qt: add copyrightLabel to aboutdialog.ui

- add a new label, which can be updated independently from the whole
  license information stuff
- the benefit is, we don't need to re-translate that whole wall of text
  every year the copyright info changes
- update to the same copyright string we use in the source and in the
  paycoin-qt.exe meta-data information
- removes an obsolete entry from the ui-file

mitchellcash/paycoin,IngCr3at1on/paycoin,mitchellcash/paycoin,LambocoinFoundation/Lambocoin,LambocoinFoundation/Lambocoin,ligerzero459/paycoin,PaycoinFoundation/paycoin,IngCr3at1on/paycoin,ligerzero459/paycoin,ligerzero459/paycoin,PaycoinFoundation/paycoin,LambocoinFoundation/Lambocoin,IngCr3at1on/paycoin,PaycoinFoundation/paycoin,LambocoinFoundation/Lambocoin,ligerzero459/paycoin,IngCr3at1on/paycoin,PaycoinFoundation/paycoin,mitchellcash/paycoin,mitchellcash/paycoin