Right now the indicator itself tracks all devices and connections,
creates and destroys the corresponding menu items, matches them
to a section and updates the connection/device arrays that are
attached to the section.
Sounds messy?
It is slightly less effective to connect multiple handlers to the
same NMClient, but let's assume that devices and connections aren't
added/removed at 60 frames/s, and we can add some readabilty by
moving the code into different classes that only have to care about
the bits that are relevant to them.
The VPN section is a good starting point, because its handling is
already quite different from device sections.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2407>
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