Max to Sunflow Exporter v0.20 released

I've updated the script again, adding instanced objects, meshlights, light sample settings, and a couple of small bug-fixes.

Meshlights need to be set up exactly how the script needs them: the
object MUST have a name beginning with "meshlight", and a standard
material with an output map in the diffuse channel. The diffuse color
is multiplied by the output amount to get the radiance amount.

I've also removed all of the image and animation settings from the
exporter. You now just set them up in the Render Scene Dialog, like you
would for a normal render.

It looks like I may have messed up material export a bit, so I'll try and get that sorted out next...