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_kita.cpp

@@ -189,7 +189,7 @@ static int useHeapInit(fopAc_ac_c* a_this) {
             return 0;
         }
 
-        i_this->mKitas[i].mBgW = new dBgW();
+        i_this->mKitas[i].mBgW = JKR_NEW dBgW();
         if (i_this->mKitas[i].mBgW == NULL) {
             return 0;
         }