Fixes #1945.

This got broken with recent changes in ImageUtils.loadTexture.

Now it's more like TrackballControls. This wheel zoom was too intensive finger action for me ;)

As a reminded that we need to move all that to the objects themselves...

Calling SceneUtils.cloneObject fails when adding an
Object3D with compiled JS file as THREE.MarchingCubes
hasn't been defined.

Added this.range parameter. Range check could be done manually afterwards. But when interested if multiple projectiles (=rays) hit a moving mesh, a lot of time is wasted on checking the mesh faces should the mesh still be out of range. If no range is specified, behaviour remains the same.

As per discussion in #1889.