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/calculator/main.orc

@@ -1,14 +1,15 @@
-import std::(proc::*, to_float, to_string, io::(readline, print))
+import std::(proc::*, to_float, to_string, panic, str::char_at)
 
-export main := do{
+export const main := do{
   cps print "left operand: ";
-  cps data = readline;
+  cps data = readln;
   let a = to_float data;
   cps print "operator: ";
-  cps op = readline;
-  cps print ("you selected \"" ++ op ++ "\"\n");
+  cps op = readln;
+  let op = char_at op 0;
+  cps println ("you selected \"" ++ op ++ "\"");
   cps print "right operand: ";
-  cps data = readline;
+  cps data = readln;
   let b = to_float data;
   let result = (
     if op == "+" then a + b
@@ -17,6 +18,6 @@ export main := do{
     else if op == "/" then a / b
     else (panic "Unsupported operation")
   );
-  cps print ("Result: " ++ to_string result ++ "\n");
+  cps println ("Result: " ++ to_string result);
   0
-}
+}