Look into ECS system

[cpadilla]

Investigate setting up ECS as the main loop of the game engine.

[cpadilla]

Based on this talk by Catherine West (of Chucklefish), I want to implement generational indices into the list of entities used in the ECS system. Most likely this crate: https://docs.rs/generational-arena/0.2.8/generational_arena/

Will likely implement ECS according to: https://ianjk.com/ecs-in-rust/