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Adding a signal to a signalbus

ISignalBus_Add() is used to add an already created signal to the signalbus.

The advantage of using ISignalBus is that multiple signals that are waiting for a particular event can be attached to a single bus. The signalbus keeps track of all attached signals. When a signal is set on the bus, each signal receives the callback notification that was registered when the signal was created.

Note: The order of receiving callback notifications is not necessarily in the same as the order in which the signals were created or added to the signalbus.