Improve curve export to match between Blender and GE

[StjerneIdioten]

Currently curves in Blender is only used to specify some control points that then goes in GE. But since Blender and GE does not share the same way of defining the curves and no "translation" is done. The curve in GE is often quite different from the one in Blender. It would be ideal to do some form of conversion (By inserting more/less points) to get to the way GE handles things.

This question for Blender might have some hints since GE seems to be using quadratic curves as well.