Upgraded to BufferGeometry

[DustinBrett]

Finally took the time to get this going on latest (r133) three.js with the new BufferGeometry.

Fix for https://github.com/tengbao/vanta/issues/101

I based a good amount of my changes on https://sbcode.net/threejs/geometry-to-buffergeometry/

Works on my machine ;-)

[basgeertsema2000]

Do you think you could fix globe too? I've been trying but I haven't fixed it completely yet. I know it's alot to ask so a no is expected :)

[luksak]

@DustinBrett Works for me. Thanks!

[jacksongoode]

@tengbao Any interest in basing dependency updates on this?

[OmnesPotens]

Do you think you could fix globe too? I've been trying but I haven't fixed it completely yet. I know it's alot to ask so a no is expected :)

@basgeertsema2000 This should be resolved in #143