mod_component: Remove some commented code

core.configmanager: Make components use 'component' module by default if none specified

Update example config, categorise modules, add new modules

prosody.cfg.lua.dist: Remove some factual inaccuracies

mod_component: Use net_activate_ports to start port listener based on config

mod_component: Set default listening interface to 127.0.0.1

net.connlisteners: Allow listeners to specify default interface

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