Isolate JKRHeap operator overloads

Fixes #25

This isolates the JKRHeap operator new/delete overloads. Every single new/delete site in the code has been replaced with a macro.

Sadly for new[] and delete[] we have to keep global operators. The global new[] just allocates into malloc() however, and delete[] goes into free() if it's not in a JKRHeap. So that's fine.

src/d/actor/d_a_obj_fmobj.cpp

@@ -58,7 +58,7 @@ static int useHeapInit(fopAc_ac_c* i_this) {
         return 0;
     }
 
-    a_this->mpBgW = new dBgW();
+    a_this->mpBgW = JKR_NEW dBgW();
     if (a_this->mpBgW == NULL) {
         return 0;
     }