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/d_tresure.cpp

@@ -11,7 +11,7 @@ static bool data_80450680 = true;
 dTres_c::typeGroupData_c* dTres_c::mTypeGroupData;
 
 int dTres_c::createWork() {
-    mTypeGroupData = new dTres_c::typeGroupData_c[0x40];
+    mTypeGroupData = JKR_NEW dTres_c::typeGroupData_c[0x40];
     return 1;
 }