Fixing some showstoppers

- inertness now tracked separately from gas
- atomic_impl now correctly rolls over when the argument is inert
- syntax fixes
- tree shaking

src/external/str/char_at.rs

@@ -12,7 +12,7 @@ use crate::representations::interpreted::{Clause, ExprInst};
 
 #[derive(Clone)]
 pub struct CharAt2;
-externfn_impl!(CharAt2, |_: &Self, x: ExprInst| {Ok(CharAt1{x})});
+externfn_impl!(CharAt2, |_: &Self, x: ExprInst| Ok(CharAt1{x}));
 
 /// Partially applied CharAt function
 ///