cleaned up mesh exporter

[pollend]

I just cleaned up the exporter. removed the extra imports and simplified how exports works. The old export will try to split up every vertex into it's own quad. This rework will keep a quad together when producing the final output. This also adds an importer to import a shape into blender.

The basic testing procedure would be to open one of the sample blender shapes and use the output shape with Terasology and ensure the geometry generates correctly when loading a world.

Steps

procedure 1

• open a blender shape
• save shape
• replace an existing shape in terasology and verify that everything loads correctly

procedure 2

• load in a shape into an empty blender file
• save shape back out
• verify that the world loads with the saved shape from blender.

[Cervator]

Nicely done :-) At first I thought this was about the 3d model export @kartikey0303 has worked on most recently, but this is the other one for block shapes. That also does mean I have no idea how to test it. What object did you try it on?