Replace toString of wrapper functions with the toString of the origin…

…als. (#9)

Wrapping functions was making it difficult to call toString() on functions to
get their content, and led to harder debugging. By overriding the wrapper
function's toString, we're able to print out the original content of the
wrapped functions.

screeps-profiler.js

@@ -75,7 +75,7 @@ const functionBlackList = [
 ];
 
 function wrapFunction(name, originalFunction) {
-  return function wrappedFunction() {
+  function wrappedFunction() {
     if (Profiler.isProfiling()) {
       const nameMatchesFilter = name === getFilter();
       const start = Game.cpu.getUsed();
@@ -94,7 +94,12 @@ function wrapFunction(name, originalFunction) {
     }
 
     return originalFunction.apply(this, arguments);
-  };
+  }
+
+  wrappedFunction.toString = () =>
+    `// screeps-profiler wrapped function:\n${originalFunction.toString()}`;
+
+  return wrappedFunction;
 }
 
 function hookUpPrototypes() {