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/io/io.orc

@@ -0,0 +1,31 @@
+import std::panic
+import system::io
+import system::async::yield
+
+export const print := \text.\ok. (
+  io::write_str io::stdout text
+    (io::flush io::stdout
+      ok
+      (\e. panic "println threw on flush")
+      yield
+    )
+    (\e. panic "print threw on write")
+    yield
+)
+
+export const println := \line.\ok. (
+  print (line ++ "\n") ok
+)
+
+export const readln := \ok. (
+  io::read_line io::stdin
+    ok
+    (\e. panic "readln threw")
+    yield
+)
+
+export module prelude (
+  import super::*
+
+  export ::(print, println, readln)
+)