3d Rendering Improvements

This pull includes several 3d rendering improvements:

Tubes & Transitions are drawn with thickness: Both the ID and OD are shown.
-The Paint and decals are applied to the outside of a tube
-The ends are painted, no decals
-The inside is drawn with the unpainted appearance

Fin edges are rendered with a non-square cross section if they are round or airfoil
-geometry is just a simple wedge
-rounding done with smoothed normals

Transitions and nosecones are drawn better.
-normals are properly smoothed
-higher LOD near tip for better looking rounded tips

Here are some visuals "Before & After":
![improvements](https://f.cloud.github.com/assets/1305026/268163/69629ed6-8f0f-11e2-8611-e5f87b587ff8.png)