mrview revert remove gesture debug output, cleanup
mrview revert remove gesture debug output, cleanup

This reverts commit 118287d592fe3addb61267dbb076b002935ed996.

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3