Enable host lookups for -proxy and -onion parameters
Enable host lookups for -proxy and -onion parameters

* Extends -dns parameter (via fNameLookup) to control these two new
  parameters in addition to -addnode, -connect, and -seednode

* Moves fNameLookup assignment earlier as needed

* Changes -proxy and -onion to use Lookup() instead of LookupNumeric()

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