cl-ast: Cleanup

- Function bind is now one Pattern
- TyRef now allows &Ty (i.e. &[i32], &(char, bool)
- Range patterns (they cannot bind, only check whether a value is in range
- ArrayRep repeat has been reverted to usize, for now, until early consteval is implemented.

sample-code/match_test.cl

@@ -5,14 +5,14 @@ struct Student {
     age: i32,
 }
 
-fn Student (name: str, age: i32) -> Student {
-    Student: { name, age }
+fn Student(name: str, age: i32) -> Student {
+    Student { name, age }
 }
 
 fn match_test(student: Student) {
     match student {
-        Student: { name: "shark", age } => println("Found a shark of ", age, " year(s)"),
-        Student: { name, age: 22 } => println("Found a 22-year-old named ", name),
-        Student: { name, age } => println("Found someone named ", name, " of ", age, " year(s)"),
+        Student { name: "shark", age } => println("Found a shark of ", age, " year(s)"),
+        Student { name, age: 22 } => println("Found a 22-year-old named ", name),
+        Student { name, age } => println("Found someone named ", name, " of ", age, " year(s)"),
     }
 }