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

examples/maps/main.orc

@@ -1,6 +1,6 @@
-import std::(proc::*, io::print, to_string)
+import std::(proc::*, to_string)
 
-export main := do{
+export const main := do{
   let foo = map::new[
     "foo" = 1,
     "bar" = 2,
@@ -9,6 +9,6 @@ export main := do{
   ];
   let num = map::get foo "bar"
     |> option::unwrap;
-  cps print (to_string num ++ "\n");
+  cps println $ to_string num;
   0
-}
+}