Integrated entity+meter .js<->Java methods.
Still need create sample skeleton, action, and effect .js files and
integrate those.

Sad news: Creating an entity takes 5-6ms. A standard frame should be
16ms or less. I might need to multithread this (which I've slowly been
moving towards).

Or just decrease FPS to 30. That gives 33.33 ms for a gametick per
second. (which theoretically allows 5 entity creations per frame.
Considering thats 150 entity creations per second, still a lot. Just
that some frames might be overloaded if some modders decide to create
entities on the same frame.