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_movebox.cpp

@@ -1109,7 +1109,7 @@ void daObjMovebox::Act_c::mode_afl() {
 }
 
 static void dummy() {
-    delete (dBgS_ObjGndChk*)NULL;
+    JKR_DELETE((dBgS_ObjGndChk*)NULL);
 }
 
 void daObjMovebox::Act_c::mode_proc_call() {