Generic mutation scheduling system

IO adapted to use it
Also, Atoms can now dispatch type-erased requests

src/systems/io/mod.rs

@@ -1,6 +1,11 @@
+//! System that allows Orchid to interact with trait objects of Rust's `Writer`
+//! and with `BufReader`s of `Reader` trait objects
+
 mod bindings;
-mod facade;
+// mod facade;
 mod flow;
 mod instances;
+mod service;
 
-pub use facade::{io_system, IOStream, IOSystem};
+// pub use facade::{io_system, IOStream, IOSystem};
+pub use service::{Service, Stream, StreamTable};