Allow built-in objects to be created with new X()

ChangeLog

@@ -22,6 +22,7 @@
             Add E.dumpFragmentation to show memory fragmentation (only for debug builds)
             Fix parsing of dates from before 1970
             nRF52: Fix some regressions in requestDevice (flagged up by asserts in debug build)
+            Allow built-in objects to be created with `new X()`
 
      2v00 : Allow changeInterval with large (>32 bit) intervals (fix #1438)
             changeInterval now changes the interval immediately when it's called inside the interval it is changing (fix #1440)

scripts/build_jswrapper.py

@@ -244,7 +244,7 @@ for className in classes:
   if not className in constructors:
     jsondatas.append({
         "type":"constructor", "class": className,  "name": className,
-        "generate_full" : "jsvNewWithFlags(JSV_OBJECT)",
+        "generate_full" : "NULL", # return undefined means 'new X' uses the object that was returned, which is correct
         "filename" : "jswrapper.c",
         "return" : [ "JsVar", "" ]
     });