Remove tight dependency on ThreeJS repo for draco loader

[afonsobspinto]

As a continuation of #430 we should rethink the way we are setting the dracoLoader path to avoid future problems with threejs changes.

[enicolasgomez]

Apparently we can use the node_modules/ThreeJS draco encoders that are already in the repo.

[afonsobspinto]

Try with webpack copy plugin

[afonsobspinto]

Relying on webpack doesn't seem the best option to me because that's a fix at the application level.

Setting the draco loader path to the folder in node modules seems to work:

    dracoLoader.setDecoderPath('../../../node_modules/three/examples/js/libs/draco/');