#15 Split the mesh in the 3DS exporter

[Marcus Geelnard]

Since the 3DS file format can not handle meshes with more than 65536 triangles / vertices, but DOES handle multiple meshes, it would be nice if a single mesh that consists of several unconnected "triangle islands" could be split into several meshes when doing the 3DS export.

This would enable more models to be exported as 3DS (for instance the Audi TT wheel).