* use urlfilter v0.4.0

Now we pass filtering rules to urlfilter as filer file names,
 rather than the list of rule strings.
(Note: user rules are still passed as the list of rule strings).

As a result, we don't store the contents of filter files in memory.

home/dns.go

@@ -180,8 +180,8 @@ func generateServerConfig() dnsforward.ServerConfig {
 	})
 	for _, filter := range config.Filters {
 		filters = append(filters, dnsfilter.Filter{
-			ID:   filter.ID,
-			Data: filter.Data,
+			ID:       filter.ID,
+			FilePath: filter.Path(),
 		})
 	}