Define MxLong/MxULong (#71)

* define MxLong/MxULong

The "long" type has different sizes on different platforms, and this may cause issues.

* use DWORD to match RegQueryValueExA arg

LEGO1/legosoundmanager.cpp

@@ -13,7 +13,7 @@ LegoSoundManager::~LegoSoundManager()
 }
 
 // OFFSET: LEGO1 0x1002a3a0 STUB
-long LegoSoundManager::Tickle()
+MxLong LegoSoundManager::Tickle()
 {
   // TODO
   return 0;