Separate systems into files (or at least discrete methods)?

[cpowell]

This is perhaps more of a question/discussion than an issue. Does Flecs-Rust have the ability to organize systems either by file or by separate discrete method?

As my collection of systems expands, my fn setup_systems() method is growing longer and becoming an unwieldy giant wall-of-text. I'd love to have separate, easily-documentable methods: movement_system(), vision_system(), etc. Another possibly desirable outcome might be the ability to separate by file: movement_system.rs, for example.

Is there an example demonstrating how Flecs-Rust can do this? I've not been able to find any demo code that does so.