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.

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)