switch Rcu to the arcu crate

The arcu crate is a more general implementation of the Rcu I implemented in here in scryer. It contains some bug-fixes regarding race-conditions in the Rcu update function, which could cause leaks and uses after free.

Source of the problem was the Relaxed load/strore/update of the reference count in side the Arc not being properly ordered with other load/stores.

src/lib.rs

@@ -42,8 +42,6 @@ pub mod types;
 
 use instructions::instr;
 
-mod rcu;
-
 #[cfg(target_arch = "wasm32")]
 use wasm_bindgen::prelude::*;