When ready, reference 3rd-party Javascript code from remote location

[gregvonkuster]

The following are currently referenced locally, and should be referenced from their remote source. VTKLoader.js will need to be submitted to mr. door when we're ready.

    ${h.javascript_link( app_root + 'dat.gui.min.js' )}
    ${h.javascript_link( app_root + 'three.min.js' )}
    ${h.javascript_link( app_root + 'Detector.js' )}
    ${h.javascript_link( app_root + 'Lut.js' )}
    ${h.javascript_link( app_root + 'OrbitControls.js' )}
    ${h.javascript_link( app_root + 'PLYLoader.js' )}
    ${h.javascript_link( app_root + 'VTKLoader.js' )}

[pletzer]

VTKLoader was commited so can use remote version.
I don't think PLYLoader was ever modified so should be able to use remote version.
Ditto for OrbitsControls.js for Detector.js data.gui.js and three.min.js.
Lut.js is no longer used.

[pletzer]

@gregvonkuster Should be able to use VTKLoader.js from devel branch of three.js