Added skin and morph support to the 3DSMax exporter

We had some models stuck in .max files that we wanted to show off in a web browser, but the 3DSMax Exporter tool didn't support the skinned animation or morph targets that our model had, so I added those in.

The new tool supports merging and exporting multiple meshes at once, like the old one, with the caveat that only one can have skins or meshes. I put it under a new file rather than clobbering the old one because I don't understand some of the old one's options, and I probably broke them.

I also added in our model to the examples as sample output. We haven't picked an animation yet, but morph targets work, and the support should be there when we do need them.