update & port to Three r68 (current master)

tested to work withour errors with local gltf and xml3d / suzanne examples and client-server with the Physics2 example.

NOTE: breaks Ludo's avatar / skeleton examples as the skel things have changed in three.js

pong or other in-external-repos apps not tested / ported yet (probably the now immutable pos/rot/scale params pop up there too).

am planning to test also with current dev of three.js which has changed even more, but OTOH has optimizaions for mobiles and PVRTC loading for iOS devices etc.