Shape drawing aspect

In order to improve the shape drawing visibility for the user studied the Aspect and Shading of drawings. Succeeded to change shape edge color to better differentiate the shapes in scene.
Edge drawing enabled shows some other problems, it seems that some generated shapes (like extrudes) have interior edges. I'll continue investigate the shape topology that we currently use. Maybe fixing this problem will solve other issues that we have on some cases when applying complex algos on complex shapes.