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/systems/stl/proc.orc

@@ -0,0 +1,22 @@
+import super::fn::=>
+
+-- remove duplicate ;-s
+export macro do {
+  ...$statement ; ; ...$rest:1
+} =0x3p130=> do { 
+  ...$statement ; ...$rest
+}
+export macro do {
+  ...$statement ; ...$rest:1
+} =0x2p130=> statement (...$statement) do { ...$rest }
+export macro do { ...$return } =0x1p130=> ...$return
+
+export macro statement (let $name = ...$value) ...$next =0x1p230=> (
+  ( \$name. ...$next) (...$value)
+)
+export macro statement (cps ...$names = ...$operation:1) ...$next =0x2p230=> (
+  (...$operation) ( (...$names) => ...$next )
+)
+export macro statement (cps ...$operation) ...$next =0x1p230=> (
+  (...$operation) (...$next)
+)