Holiday Schedule Should not tag to exchange

Holiday schedules are currently tag to exchange, it should not.

E.g
NK225 traded on SGX should actually follow Japan Holidays.
STW traded on SGX should follow Taiwan Holidays.

With more cross listings coming in the future, MC should give users the option to tag holidays to the underlying instead of exchange.

thanks

Thanks for the input, we'll consider this - actually, the holiday list is not working in the present versions.