JS: Better texture set handling in the collada parser
JS: Better texture set handling in the collada parser

This should nominally be able to correctly bind models with mulitple
texture sets specified. We are still contrained to only one active set
though.

Signed-off-by: Matt Chudleigh <0ca390ed93f516590d05286882efa52bb3b35616@ausenco.com>
Signed-off-by: Harvey Harrison <eadbd6b462bf3c97df0300a934c12bc2e5d1fe51@ausenco.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim