[3D Beta] Override marker colors

[amacneil]

In the current 3D panel, I can override marker colors (both regular and mesh markers):

In 3D Beta, this does not seem possible (no arrow to expand settings).

We should implement this for feature parity.

[defunctzombie]

Regarding the "form polygons" feature this screenshot shows - we've decided to leave it out of the GA and see if someone asks for it.

We still need the override marker colors. That was asked for by a user.