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_ihasi.cpp

@@ -117,7 +117,7 @@ static int useHeapInit(fopAc_ac_c* i_actor) {
         return 0;
     }
 
-    i_this->mpBgW = new dBgW();
+    i_this->mpBgW = JKR_NEW dBgW();
     if (i_this->mpBgW == NULL) {
         return 0;
     }
@@ -136,7 +136,7 @@ static int useHeapInit(fopAc_ac_c* i_actor) {
         return 0;
     }
 
-    i_this->mpBtkAnm = new mDoExt_btkAnm();
+    i_this->mpBtkAnm = JKR_NEW mDoExt_btkAnm();
     if (i_this->mpBtkAnm == NULL) {
         return 0;
     }