Reworked the TextureObjectManager singleton so that it no longer reconstructed itself once deleted, and added checks to against a null manager to prevent calling code crashing.
Reworked the TextureObjectManager singleton so that it no longer reconstructed itself once deleted, and added checks to against a null manager to prevent calling code crashing.


omega-hub/osg,koshman86/osg,ghub/osg,ntoand/osg,stmh/osg,ntoand/osg,stmh/osg,omega-hub/osg,artoolkit/osg,ghub/osg,ntoand/osg,ntoand/osg,ghub/osg,stmh/osg,stmh/osg,artoolkit/osg,XiaoCC/osg,XiaoCC/osg,XiaoCC/osg,stmh/osg,koshman86/osg,artoolkit/osg,XiaoCC/osg,XiaoCC/osg,koshman86/osg,artoolkit/osg,koshman86/osg,omega-hub/osg,ghub/osg,omega-hub/osg