Improved cube visualization features

[phpanzini]

Viewing the LUT cube can be extemely invaluable to understand what's going on in a LUT.
To make this truly usable, some enhancements would be needed:

• Choice of orthographic projection (instead of perspective)
• Choice of preset views: Front, Left, Right, Back, Top, Bottom, Corners. Also, Neutral axis pointing up, with rotation around neutral axis.
• Ability to move the front of the viewing frustum, such that one slices through the cube, along the view axis. This will allow to view the interior of the cube. This has to be dependent on the view angle and not on the cartesian planes of the cube, so one can slice the cube ay any angle.
• Option to switch the cube dot colour black or white, at a regular interval, such that one sees a grid of points within thee cube lattice. This will allow better understanding of the distribution of dots.
• Option to densify the dots (and change their relative radius) so one fills-in the cube space. The additional (virtual) dot positions would be interpolated using tricubic interpolation.
• Labels for R, G, B, C, M, Y, W, K at the cube corners.
• Transformation/Projection of cube into Lab, HSV, LcH spaces
• Option to Make the Curves chart square.
• Ability to pick a dot in the cube view and get its IN and OUT RGB values.
• Ability to mark a dot in the cube (it gets a contrasting colour): This will make it easier to follow how the dot moves from the unity cube, to the transformed cube. Option to trace the path of the dot as it goes from unity to transformed.