Switch to NetGuard as VPN core

.gitignore

@@ -1,7 +1,14 @@
-app/libs/
+/app/full
+/app/play
 
-app/full/
-app/play/
+/app/release
+/app/play
+
+/.idea
+/tools/config.sh
+keystore.properties
+
+.cxx/
 
 # Built application files
 *.apk

ADBLOCKING.md

@@ -0,0 +1,37 @@
+Ad Blocking with TrackerControl
+-------------------------
+
+Instructions (you need to follow **all** the steps):
+
+1. Enable the setting *'Block domain names'* in the advanced options (three dot menu > Settings > Advanced options > Block domain names; default is enabled)
+1. Import or download [a hosts file](https://en.wikipedia.org/wiki/Hosts_(file)) using the TrackerControl backup settings (three dot menu > Settings > Backup > Download hosts file)
+1. Disable browser compression (in Chrome: three dot menu > Settings > Data Saver > Off)
+1. Wait at least 10 minutes to let the Android DNS cache time out
+1. Test to see if ad blocking works by opening [this page](http://www.netguard.me/test)
+1. Enjoy ad blocking, but don't forget to support application developers and website authors in other ways
+
+<br />
+
+Troubleshooting:
+
+Because of routing bugs, some devices/Android versions require:
+
+* the advanced option *Manage system applications* to be enabled and/or
+* the network option *Subnet routing* to be disabled and/or
+* two (not just one) DNS server addresses to be set in the advanced options, for example 8.8.8.8 and 8.8.4.4
+
+<br />
+
+Note that:
+
+* applications, like web browsers, may cache data, so you may need to clear caches
+* applications, browsers mostly, that have a *"data saver"*-like feature that proxies requests through their servers (eg. Opera w/ Turbo, Opera Max, Puffin, Chrome w/ data saver, UC Browser, Yandex w/ Turbo, Apus Browser, KK Browser, Onavo Extend, Maxthon) will not have ads blocked as TrackerControl cannot see those domain requests
+* YouTube ads are not domain-based, and thus cannot be blocked with TrackerControl
+* TrackerControl ignores the IP addresses in the hosts file, because it does not route blocked domains to localhost
+* When TrackerControl imports the hosts file, it automatically discards any duplicates entries, so duplicate entries are not a problem and have no performance impact after the file is imported
+* you can check the number of hosts (domains) imported by pulling the TrackerControl notification down using two fingers if your version of Android supports that functionality
+* wildcards are not supported due to performance and battery usage reasons
+* it is not possible to edit the hosts file (change/add/delete domain names) with TrackerControl
+* you can disable ad blocking by disabling the setting *'Block domain names'* in the advanced options
+* **ad blocking is provided as-is**, see also [here](https://forum.xda-developers.com/showpost.php?p=71805655&postcount=4668)
+* **ad blocking is not available when TrackerControl was installed from the Google Play store!** (disable automatic updates of TrackerControl in the Play store application)