Support specification of direction and position in lightshader (again).
Support specification of direction and position in lightshader (again).

ariyapour/xml3d.js,Fiware/webui.Xml3d.js,xml3d/xml3d.js,Fiware/webui.Xml3d.js,CCLDESTY/xml3d.js,xml3d/xml3d.js,CCLDESTY/xml3d.js,ariyapour/xml3d.js