update fbx converter to the new model format - closes #397
update fbx converter to the new model format - closes #397

dreamsxin/LuxEngine,dreamsxin/LuxEngine,galek/LumixEngine,gamedevforks/LumixEngine,JakubLukas/LumixEngine,JakubLukas/LumixEngine,galek/LumixEngine,zhouxh1023/LumixEngine,JakubLukas/LumixEngine,gamedevforks/LumixEngine,zhouxh1023/LumixEngine