System Inputs, Outputs, Chaining, and Registration Ergo #876
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Time for another round of ECS improvements!
System Registration Ergonomics: add_system() now takes a generic IntoSystem type instead of a boxed system
System Inputs and Outputs: The
System
trait now has Input and Output associated types.System<Input = X, Output = Y>
System Chaining. This allows us to make "result systems" with error handlers (among other things)
Note: only
System<Input = (), Output =()>
systems can be added to a schedule. Schedules don't know how to populate inputs, nor do they know what to do with outputs.