STL rework

- fixed lots of bugs
- overlay libraries work correctly and reliably
- the STL is an overlay library
- examples updated

src/pipeline/import_resolution/decls.rs

@@ -4,4 +4,5 @@ use crate::interner::{Sym, Tok};
 
 trait_set! {
   pub trait InjectedAsFn = Fn(&[Tok<String>]) -> Option<Sym>;
+  pub trait UpdatedFn = Fn(&[Tok<String>]) -> bool;
 }