Re-architecture: get rid of require.js / streamline includes

[Logodaedalus]

The whole "mapping a json file to a string alias and then putting that alias in an array of strings at the top of Coordinator in the proper order" is a total nightmare.

We might be able to do away with this and re-factor it using ES6 classes (probably most hygienic way?)

Key requirements:

1. Doesn't introduce weird loading bugs for long file parsing, etc (test with large scenes)
2. Doesn't require you to type strings in multiple places in the correct order.