Clean up text handling a bit:

- Rename IO.write -> IO.print.
- Make IO.write not print a newline.
- Support \u Unicode escapes in strings.

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.
 }