Raise error if level size wasn't specified.

Signed-off-by: Deukhoofd <Deukhoofd@gmail.com>

src/Defines.hpp

@@ -11,6 +11,8 @@ typedef uint16_t level_int_t;
 typedef uint32_t level_int_t;
 #elif LEVEL_U64
 typedef uint64_t level_int_t;
+#else
+#error No Level size was specified
 #endif
 
 #endif // CREATURELIB_DEFINES_HPP