Follow-ups from Axis aligned camera POV

The following discussion from !106 (merged) should be addressed:

• @kartmann started a discussion:

  To do in follow up:

  • Bug when aggressively clicking the orientation indicator => #211 (closed)
  • Fix NUM 9 not triggering gravity mode
  • Offer another option to switch to gravity mode (e.g. settings, view menu)
  • Fix buttons in view menu corresponding to NUM 1, 3, 7 not triggering the action