Make constructors just methods.

* Eliminate "new" reserved word.
* Allow "this" before a method definition to define a constructor.
* Only create a default constructor for classes that don't define one.

test/language/break/closure_in_for.wren

@@ -1,7 +1,7 @@
 var f
 for (i in [1, 2, 3]) {
   var j = 4
-  f = new Fn { IO.print(i + j) }
+  f = Fn.new { IO.print(i + j) }
   break
 }
 

test/language/break/closure_in_while.wren

@@ -1,7 +1,7 @@
 var f
 while (true) {
   var i = "i"
-  f = new Fn { IO.print(i) }
+  f = Fn.new { IO.print(i) }
   break
 }
 

test/language/break/in_function_in_loop.wren

@@ -1,6 +1,6 @@
 var done = false
 while (!done) {
-  new Fn {
+  Fn.new {
     break // expect error
   }
   done = true