Added support to the new mesh format of atoms 3

[iaiotom]

This will handle the new mesh format and also the old one at the same time. The old mesh are converted to the new format at loading time.

[andrewkaufman]

Thanks @iaiotom. I only left a couple notes here. I'm sure you know more than I do regarding all the Atoms API changes. One thing I'd like though is more thorough testing, since we're not too familiar with the changes on your side, it'd be great to have higher confidence that these changes are going to (a) keep our existing shots rendering the same and (b) improve the experience with the newly cached data. In particular I'd like to see some testes verifying that the Sets are coming through now, and that the transform matrices, bounds, and mesh positions are all in the expected spaces.

[iaiotom]

I've added the tests for the last features I've added

[iaiotom]

ACS-111 fix

[andrewkaufman]

Thanks @iaiotom ! Confirmed this fixes several issues on our end.