Utility subsystem for actually connecting to network (#1205)

* define subsystems skeleton

* Create a blank section for each subsystem in the initial batch

* write out basics for most subsystems

* define network bridge subsystem

* integrate network bridge into network systems

* Apply suggestions from code review

some nits

Co-authored-by: Max Inden <mail@max-inden.de>

* clean up wording

Co-authored-by: Max Inden <mail@max-inden.de>