March 8, `25: Upgraded to THREE r174, examples are all modules in one page

[kellycode]

Required very few changes to upgrade to r174:

updateRange changed to addUpdateRange and THREE.Math.generateUUID is gone so made SPE.utils.generateUUID

...most of the work was in the examples.

Changed the examples to modules for faster three upgrade testing and made a new BasicScene.js class to simplify the example repetitive scene building, and removed old local dependencies.

I'm upgrading an old project that uses this and that's what got me here. It's a nice particle engine and worth the upgrade time.

Great fun