GeoIP: Add MaxMind GeoLite2-Country database 2018113, gzipped

Database and Contents Copyright (c) 2018 MaxMind, Inc.
This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/.
This database incorporates GeoNames [http://www.geonames.org] geographical data,
which is made available under the Creative Commons Attribution 3.0 License.
To view a copy of this license, visit http://www.creativecommons.org/licenses/by/3.0/us/.
- Drop old ipv4 and ipv6 data files and build scripts
- Build changes for new file

router/java/src/net/i2p/router/RouterVersion.java

@@ -18,7 +18,7 @@ public class RouterVersion {
     /** deprecated */
     public final static String ID = "Monotone";
     public final static String VERSION = CoreVersion.VERSION;
-    public final static long BUILD = 5;
+    public final static long BUILD = 6;
 
     /** for example "-test" */
     public final static String EXTRA = "";