Texture Support

[cignoni]

We should definitely have it.

In the Color dialog of the rendering tab there should be something to show the name of the file of the texture and the possibility to use the texture as base albedo color (togheter with uniform/pervertex/perface)

As a dedicated 2D ui space for viewing images and parametrizations we use one other tab called "texture" where we show the texture(s) of the current mesh. there is a button to show the parametrization in the image space.
There are Rulers on the side of the image (for uv coord) and the image is draggable and zoomable

Optionally we need a space to list all the textures associated with a mesh
it could be a combobox in this tab or a subtree element in the layer list.