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Fixes #270

Closes #269

This commit also adds various optimizations to the DnsQuery entity:
 - responses is not a MutableList anymore. This allows emptyList() to be used, saving memory.
 (- because of the prior point the query listener does not need to convert the responses to a MutableList from an immutable list, saving memory)
 - parsedResponses is now lazy. Before it was calculated for every row in the query log (every time it was scrolled to)
 - Added isHostBlockedByDnsServer, which makes it obsolete for the query log to calculate this flag for every row.
 - The StringListConverter now doesn't call gson for empty lists, saving time
 -

Closes #261

Closes #267

Implements #264

Closes #259

Closes #258

The first request is always going to be slower because it is a cold-start. Subsequent requests are going to be faster.

Closes #260

Implements #250

Implements #257

Together with the PrivateDNS warning text this text would imply that Nebulo knows the privacy policy of the server active, which it does not.

Implements #253