Get rid of bytecodes for list literals.

Just compile them to:

new List
.add(...)
.add(...)
...

Gets rid of some code in the interpreter loop, which is always good.
Also addresses the old limitation where a list literal could only have
255 elements.

builtin/core.wren

@@ -1,6 +1,6 @@
 class Sequence {
   map(f) {
-    var result = []
+    var result = new List
     for (element in this) {
       result.add(f.call(element))
     }
@@ -8,7 +8,7 @@ class Sequence {
   }
 
   where(f) {
-    var result = []
+    var result = new List
     for (element in this) {
       if (f.call(element)) result.add(element)
     }