Refactor systems.rs separate files

[Vrixyz]

Same approach as #412, Thanks @Aceeri !

a few notes:

• not sure what strategy to apply to use statements, when to glob or not.
• I'm tempted to add update_colliding_entities to the collider mod.
• to "minify" changes I kept the original systems.rs instead of creating a mod.rs (I personally prefer named modules). I'd understand we prefer consistency with other modules so I'll go the extra mile after confirmation.

[sebcrozet]

Looking great thank you!

not sure what strategy to apply to use statements, when to glob or not.

The code base doesn’t always applies that strategy, but, my preference would be to glob-import the bevy prelude and import the rest explicitly.

I'm tempted to add update_colliding_entities to the collider mod.

Agreed. We could also move the writeback system to a writeback.rs file, and the removal handling to a remove.rs file.

to "minify" changes I kept the original systems.rs instead of creating a mod.rs (I personally prefer named modules). I'd understand we prefer consistency with other modules so I'll go the extra mile after confirmation.

Yeah, creating a mod.rs would be great. It might be a bit old-school, but I find its much cleaner to organize all files related to the same module in a single directory.

[sebcrozet]

Fantastic, thanks!