Comment 3 for bug 1620397

Fixed all the issues mentioned and more. The development builds containing my changes should be available any time now.

I fixed the following issues in bam2egg:
 * No longer inserts an extra root group for the ModelRoot
 * Support depth test, offset and cull bin attributes
 * Preserve non-GeomNodes under Character nodes during load
 * Render attributes are applied on group level if possible
 * Support CollisionBox, CollisionTube, and CollisionInvSphere

Support for those collision shapes has been backported to 1.9.3.