Clean up text handling a bit:

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

benchmark/binary_trees.wren

@@ -26,7 +26,7 @@ var stretchDepth = maxDepth + 1
 
 var start = OS.clock
 
-IO.write("stretch tree of depth " + stretchDepth.toString + " check: " +
+IO.print("stretch tree of depth " + stretchDepth.toString + " check: " +
     new Tree(0, stretchDepth).check.toString)
 
 var longLivedTree = new Tree(0, maxDepth)
@@ -46,13 +46,13 @@ while (depth < stretchDepth) {
     i = i + 1
   }
 
-  IO.write((iterations * 2).toString + " trees of depth " + depth.toString +
+  IO.print((iterations * 2).toString + " trees of depth " + depth.toString +
       " check: " + check.toString)
   iterations = iterations / 4
   depth = depth + 2
 }
 
-IO.write("long lived tree of depth " + maxDepth.toString + " check: " +
+IO.print("long lived tree of depth " + maxDepth.toString + " check: " +
     longLivedTree.check.toString)
 
-IO.write("elapsed: " + (OS.clock - start).toString)
+IO.print("elapsed: " + (OS.clock - start).toString)

benchmark/fib.wren

@@ -8,6 +8,6 @@ var fib = fn(n) {
 
 var start = OS.clock
 for (i in 1..5) {
-  IO.write(fib.call(28))
+  IO.print(fib.call(28))
 }
-IO.write("elapsed: " + (OS.clock - start).toString)
+IO.print("elapsed: " + (OS.clock - start).toString)

benchmark/for.wren

@@ -7,5 +7,5 @@ var sum = 0
 for (i in list) {
   sum = sum + i
 }
-IO.write(sum)
-IO.write("elapsed: " + (OS.clock - start).toString)
+IO.print(sum)
+IO.print("elapsed: " + (OS.clock - start).toString)

benchmark/method_call.wren

@@ -46,7 +46,7 @@ for (i in 0...n) {
   val = toggle.activate.value
 }
 
-IO.write(toggle.value)
+IO.print(toggle.value)
 
 val = true
 var ntoggle = new NthToggle(val, 3)
@@ -64,6 +64,6 @@ for (i in 0...n) {
   val = ntoggle.activate.value
 }
 
-IO.write(ntoggle.value)
+IO.print(ntoggle.value)
 
-IO.write("elapsed: " + (OS.clock - start).toString)
+IO.print("elapsed: " + (OS.clock - start).toString)