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Is your feature request related to a problem? Please describe.

I have a script to update the controller LED's and I use those LED's to indicate what set I am on. I can do this via the advanced dialogue similar to #122 (comment), but it would be nice if I could inject something when a set becomes active. The biggest reason for this is so that it is always accurate.

I do not care for pop-ups and my GUI does not have a system tray so I would prefer to have the flexibility to implement my own notification system separate from #122.

The other benefit to doing it on set activation instead of on calling action is that it would work with while held sets, and again, always be accurate.

Describe the solution you'd like

A settings option to allow for a custom set change notification, which includes binary and arguments. The arguments could include custom message text along with variables %n for set number, %s for set name, %p for profile name, %c for controller name, and possibly others for vid:pid, index, ....

I assume that there would be an option to turn off notifications as proposed in #122. This setting could be coupled with that option in the settings dialogue.

Describe alternatives you've considered

I also considered that it might be nice to allow for more than just an execution action. e.g. maybe one could trigger a macro or key that makes the set useful in the first place. Essentially, front loading a set change with most all of the options available in the new key assignment dialogue. Obviously not allowing for a set change on set change or similar ludicrousness. My fear there is how to implement it without making the GUI obnoxious.

Additional context

No response