Added writing and reading of inlined HeightField
Added writing and reading of inlined HeightField


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