Migrate child bridge accessories to main bridge

[justjam2013]

Feature Description

Deselecting to run a plugin in a child bridge will permanently delete all accessories for that plugin:

The user is given no warning about this destructive behavior prior to selecting to run a plugin in a child bridge:

Short term solution: Add a warning that selecting to run a plugin in a child bridge on is a one-way street and that if the user decides to deselect the setting, it will cause all accessories to be deleted.
Long term solution: Migrate accessories from child bridge to main bridge when deselecting to run a plugin in a child bridge.

[bwp91]

I can add some extra text like this: ?

[justjam2013]

Yeah, that would be perfect.