Now supports IPv6 as well if a new enough windows version is used.
Which notification function to use is detect at run-time.
Now sends CHANGED event if the online interface(s) are different in any
way since it was previously checked and considered UP. CHANGED is sent
before UP in case both are detected. It does not send any CHANGED events
during the first 2 seconds after startup.
nIOService: split up the network event receiver function from the
network status init function and have the event receiver act on the
incoming event.
DNSservice: acts on network changes (flushes the host cache and restarts
ongoing name resolves)
HttpHandler: acts on network changes
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