prefix custom Qt classes with lq

The following discussion from !77 (merged) should be addressed:

• @nick.laurenson started a discussion: (+4 comments)

  Should this class have a prefix as some other have:

  1. In lidarview

  • vv : class that are not directly link to vtk, vv was for VeloView (legacy)
  • lv: same as vv but updated for LidarView

  2. In paraview

  • pq : class that are related to Qt: pq is for ParaviewQt.

  Currently, most class start for vv, and more recent one with lv. However, the Ui lib in LVCore is named lqApplicationComponenet...

  Also, the vv or lv prefix doesn't indicate if the class is related to Qt.

  The last and most modern solution would be to use namespace.

  Can you give me some input please