Eliminate wacky scales in favor of newfangled "meters."

Note: This change must only be merged in conjunction with Leo's update to the scales of the existing FST files and Ozan's post to the community about the scale change.

The base FBX scale is in centimeters.  The FST files we were using when I added the initial FBX support had scales around 15, so I used an eyeballed multipler of 0.0006 to get them to the "correct" scale in world.  To get rid of those wacky magic numbers and normalize our scales, we're going to get rid of that 15 scale from the all existing FSTs (and the uploader default), apply a centimeter to meter multiplier on load, and remove the 0.0006 scale for heads/bodies.