Feature: Listen only on specific IP address

[levicki]

Is your feature request related to a problem? Please describe.

Currently PocketRelay server listens on 0.0.0.0 (wildcard IP).

Describe the solution you'd like

It would be nice to be able to bind it to a specific IP address. Therefore, I propose adding ip (or host) option in config.json file in addition to the port which is already present.

Describe alternatives you've considered

N/A

Additional context

Security hardening.

[jacobtread]

Change added and merged into dev branch, will be available in the next server release