Most files suffered major changes

- Less ambiguous syntax
- Better parser (Chumsky only does tokenization now)
- Tidy(|ier) error handling
- Facade for simplified embedding
- External code grouped in (fairly) self-contained Systems
- Dynamic action dispatch
- Many STL additions

src/rule/matcher_vectree/shared.rs

@@ -14,7 +14,7 @@ pub enum ScalMatcher {
   P(Primitive),
   Name(Sym),
   S(char, Box<AnyMatcher>),
-  Lambda(Box<ScalMatcher>, Box<AnyMatcher>),
+  Lambda(Box<AnyMatcher>, Box<AnyMatcher>),
   Placeh(Tok<String>),
 }