Improve 'About Qt Creator' dialog

• Remove Copyright year/range. This is not necessary, and always have to be bumped. see also QTBUG-121928
• Update list of registered trademarks to:
  • Qt logo, axivion stopping software erosion logo, Qt Group logo,
  • Qt®
  • Axivion®
  • avixion stopping software erosion®
  • Boot to Qt®
  • Built with Qt®
  • Coco®
  • froglogic®
  • Qt Cloud Services®
  • Qt Developer Days®
  • Qt Embedded®
  • Qt Enterprise®
  • Qt Group®
  • Qt Mobile®
  • Qt Quick®
  • Qt Quick Compiler®
  • Squish®

• replace 'are registered trademarks of The Qt Company Ltd.' with 'are registered trademarks of The Qt Company Ltd. or its subsidiaries.' (You could also add a link to https://www.qt.io/trademark/)

• If non-commercial: Add something like

  Qt Creator is free software, and you are welcome to redistribute it
  under certain conditions.

certain conditions could link to https://www.gnu.org/licenses/gpl-3.0-standalone.html