Add method to stateset to get the number of tex unit used
Add method to stateset to get the number of tex unit used

hishamabdelrahman/osgjs,hishamabdelrahman/osgjs,cedricpinson/osgjs,cedricpinson/osgjs,gideonmay/osgjs,jmirabel/osgjs,gideonmay/osgjs,kkuunnddaannkk/osgjs,kkuunnddaannkk/osgjs,jmirabel/osgjs,hishamabdelrahman/osgjs,jtorresfabra/osgjs,gideonmay/osgjs,jtorresfabra/osgjs,cedricpinson/osgjs,jmirabel/osgjs,jtorresfabra/osgjs,kkuunnddaannkk/osgjs