Try to make observer for signal pack

[YarikTH]

It would be convenient to create an observer for a signal pack. It allows performing some actions if any of the listed signals are touched.

A similar can be done by creating a new signal that depends on this signal pack and with the type of tuple with all the types from the signal pack. But it's more verbose and the resulting tuple will be passed in observer without expansion.

[YarikTH]

Not needed