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_cb.cpp

@@ -174,7 +174,7 @@ static int useHeapInit(fopAc_ac_c* actor) {
         return 0;
     }
     if (i_this->home.angle.x == 0) {
-        i_this->mBgW = new dBgW();
+        i_this->mBgW = JKR_NEW dBgW();
         if (i_this->mBgW == NULL) {
             return 0;
         }