refactor: convert IO from singleton instance to static class with metaclass native methods

Replace the global `io` singleton object with a static `IO` class, moving the `write` native from the instance to the metaclass. Update all benchmark, example, and test files to use `IO.write()` instead of `io.write()`.

test/method/arity.wren

@@ -19,20 +19,20 @@ class Foo {
 }
 
 var foo = new Foo
-io.write(foo.method) // expect: 0
-io.write(foo.method(1)) // expect: 1
-io.write(foo.method(1, 2)) // expect: 3
-io.write(foo.method(1, 2, 3)) // expect: 6
-io.write(foo.method(1, 2, 3, 4)) // expect: 10
-io.write(foo.method(1, 2, 3, 4, 5)) // expect: 15
-io.write(foo.method(1, 2, 3, 4, 5, 6)) // expect: 21
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7)) // expect: 28
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8)) // expect: 36
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9)) // expect: 45
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) // expect: 55
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)) // expect: 66
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)) // expect: 78
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)) // expect: 91
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)) // expect: 105
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)) // expect: 120
-io.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)) // expect: 136
+IO.write(foo.method) // expect: 0
+IO.write(foo.method(1)) // expect: 1
+IO.write(foo.method(1, 2)) // expect: 3
+IO.write(foo.method(1, 2, 3)) // expect: 6
+IO.write(foo.method(1, 2, 3, 4)) // expect: 10
+IO.write(foo.method(1, 2, 3, 4, 5)) // expect: 15
+IO.write(foo.method(1, 2, 3, 4, 5, 6)) // expect: 21
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7)) // expect: 28
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8)) // expect: 36
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9)) // expect: 45
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) // expect: 55
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)) // expect: 66
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)) // expect: 78
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)) // expect: 91
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)) // expect: 105
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)) // expect: 120
+IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)) // expect: 136

test/method/long_name.wren

@@ -4,4 +4,4 @@ class Foo {
   }
 }
 
-io.write((new Foo).thisHasAMethodNameThatIsExactly64CharactersLongWhichIsTheMaximum) // expect: result
+IO.write((new Foo).thisHasAMethodNameThatIsExactly64CharactersLongWhichIsTheMaximum) // expect: result

test/method/operators.wren

@@ -16,16 +16,16 @@ class Foo {
 }
 
 var foo = new Foo
-io.write(foo + "a") // expect: infix + a
-io.write(foo - "a") // expect: infix - a
-io.write(foo * "a") // expect: infix * a
-io.write(foo / "a") // expect: infix / a
-io.write(foo % "a") // expect: infix % a
-io.write(foo < "a") // expect: infix < a
-io.write(foo > "a") // expect: infix > a
-io.write(foo <= "a") // expect: infix <= a
-io.write(foo >= "a") // expect: infix >= a
-io.write(foo == "a") // expect: infix == a
-io.write(foo != "a") // expect: infix != a
-io.write(!foo) // expect: prefix !
-io.write(-foo) // expect: prefix -
+IO.write(foo + "a") // expect: infix + a
+IO.write(foo - "a") // expect: infix - a
+IO.write(foo * "a") // expect: infix * a
+IO.write(foo / "a") // expect: infix / a
+IO.write(foo % "a") // expect: infix % a
+IO.write(foo < "a") // expect: infix < a
+IO.write(foo > "a") // expect: infix > a
+IO.write(foo <= "a") // expect: infix <= a
+IO.write(foo >= "a") // expect: infix >= a
+IO.write(foo == "a") // expect: infix == a
+IO.write(foo != "a") // expect: infix != a
+IO.write(!foo) // expect: prefix !
+IO.write(-foo) // expect: prefix -

test/method/static.wren

@@ -6,7 +6,7 @@ class Foo {
   static bar(arg) { return "on metaclass " + arg }
 }
 
-io.write((new Foo).bar)        // expect: on instance
-io.write(Foo.bar)              // expect: on metaclass
-io.write((new Foo).bar("arg")) // expect: on instance arg
-io.write(Foo.bar("arg"))       // expect: on metaclass arg
+IO.write((new Foo).bar)        // expect: on instance
+IO.write(Foo.bar)              // expect: on metaclass
+IO.write((new Foo).bar("arg")) // expect: on instance arg
+IO.write(Foo.bar("arg"))       // expect: on metaclass arg

test/method/too_many_arguments.wren

@@ -1 +1 @@
-io.write(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17) // expect error
+IO.write(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17) // expect error