* shadow_server: allow specifying IP addresses to listen on
This allows using IPv6 as well as listening only on specific
interfaces. Additionally, it enables listening on local and TCP
sockets simultaneously.
* listener: log address with square brackets
This disambiguates IPv6 addresses.
* shadow_server: check error on each socket binding
* Refactored shadow /bind-address for 2.0 compiatibility.
* Made /ipc-socket and /bind-address incompatible arguments.
* Fixed shadow /bind-address handling and description
* Allow multiple bind addresses for shadow server.
Co-authored-by: akallabeth <akallabeth@posteo.net>
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