util.lsignal: Add lsignal library for catching POSIX signals

Makefiles, util.signal: Add lsignal library for catching POSIX signals

componentmanager: Set core_route_stanza after stanza_router is loaded

componentmanager: Use core_route_stanza to reply in the default component

componentmanager: Restore default component when unregistering

componentmanager: Small logging fix

componentmanager: Improve default component stanza handler

mod_component: Deregister component on disconnect

net.adns: Flush buffer after sending DNS request

mod_component: Update for new net_activate_ports

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