0bf42af59d
This prevents a crash on Windows (and optimized mac builds) in ~PortGroup() when a ctrl surface is disabled. Despite the bundle being a shared_ptr, unloading the ctrl surface module (.dll, dylib), destroys the shared_ptr<> (or rather the memory are where the shared_ptr is stored). This later causes a segfault in ~shared_ptr<Bundle> when the PortGroup is released. It is also much nicer to have all the ctrl surface grouped into a common Bundle, rather than having a lot of bundles each with a single unnamed port.
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https://ardour.org/development.html