Get rid of MSVC's __int64

Use either int64_t, uint64_t or long long and unsigned long long, defined as per C++11 standard

Minecraft.World/ZoneFile.h

@@ -17,18 +17,18 @@ private:
     short slotCount;
 
 public:
-    __int64 lastUse;
+    int64_t lastUse;
 
 private:
     HANDLE channel;
 
 public:
-    __int64 key;
+    int64_t key;
     File file;
 
     NbtSlotFile *entityFile;
 
-    ZoneFile(__int64 key, File file, File entityFile);
+    ZoneFile(int64_t key, File file, File entityFile);
 	~ZoneFile();
 
     void readHeader();