Support changing color mode

[mwestphal]

Is your feature request related to a problem? Please describe.
Changing color modes in F3D is very complex with many system overlapping each others, many textures, scalar coloring which lets you select a scalar and so on.

This is overly complex hence rarely used.
We should focus on providing an easier experience while retaining the complexity in the background if needed.

We could imagine an interaction similar to Open3D:

• no-coloring (grey)
• color by normals
• color by tangents
• color by U/V
• render textures

And we could then switch between this modes easily

Describe the solution you'd like
An CLI option and interaction to change color mode

Describe alternatives you've considered
Open3D implements that like this:

[Open3D INFO]     Ctrl + 0..4,9: Set mesh color option.
[Open3D INFO]                    0 - Default behavior, render uniform gray color.
[Open3D INFO]                    1 - Render point color.
[Open3D INFO]                    2 - x coordinate as color.
[Open3D INFO]                    3 - y coordinate as color.
[Open3D INFO]                    4 - z coordinate as color.
[Open3D INFO]                    9 - normal as color.