Restore detailed fragment states

[Pinselohrkater]

When navigating back/restoring a fragments state:

• Info List

  • [ ] Restore vertical scroll position
  • [ ] Restore currently open group(s)

• Events

  • [ ] Restore vertical scroll position
  • [ ] Restore filter visibility & filter search text

• Dealers

  • [ ] Restore vertical scroll position
  • [ ] Restore selected category & filter visibility & filter search text