feat: rename IO.write to IO.print and add Unicode escape support in strings

Rename the IO.write method to IO.print, which now prints without a trailing newline, and add a new IO.print method that appends a newline after output. Update all benchmark, example, and test files to use IO.print instead of IO.write. Additionally, implement Unicode escape sequence parsing in the compiler's string tokenizer, supporting \uXXXX and \u{...} syntax with proper UTF-8 encoding for code points up to U+10FFFF.

test/field/closure.wren

@@ -11,6 +11,6 @@ class Foo {
 }
 
 var foo = new Foo
-IO.write(foo.closeOverGet.call) // expect: Foo field
+IO.print(foo.closeOverGet.call) // expect: Foo field
 foo.closeOverSet.call
-IO.write(foo.closeOverGet.call) // expect: new value
+IO.print(foo.closeOverGet.call) // expect: new value

test/field/default_to_null.wren

@@ -1,5 +1,5 @@
 class Foo {
-  write { IO.write(_field) }
+  write { IO.print(_field) }
 }
 
 (new Foo).write // expect: null

test/field/multiple.wren

@@ -8,11 +8,11 @@ class Foo {
   }
 
   write {
-    IO.write(_a)
-    IO.write(_b)
-    IO.write(_c)
-    IO.write(_d)
-    IO.write(_e)
+    IO.print(_a)
+    IO.print(_b)
+    IO.print(_c)
+    IO.print(_d)
+    IO.print(_e)
   }
 }
 

test/field/nested_class.wren

@@ -1,17 +1,17 @@
 class Outer {
   method {
     _field = "outer"
-    IO.write(_field) // expect: outer
+    IO.print(_field) // expect: outer
 
     class Inner {
       method {
         _field = "inner"
-        IO.write(_field) // expect: inner
+        IO.print(_field) // expect: inner
       }
     }
 
     (new Inner).method
-    IO.write(_field) // expect: outer
+    IO.print(_field) // expect: outer
   }
 }
 

test/field/object_reference.wren

@@ -11,7 +11,7 @@ class Node {
       _left.write
     }
 
-    IO.write(_value)
+    IO.print(_value)
 
     if (_right is Node) {
       _right.write

test/field/use_before_set.wren

@@ -1,5 +1,5 @@
 class Foo {
-  write { IO.write(_field) } // Compile a use of the field...
+  write { IO.print(_field) } // Compile a use of the field...
   init { _field = "value" }  // ...before an assignment to it.
 }