Issue 4612 - enable AA on first run and make automatic adding of any subscription optional

lib/prefs.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 14 matching lines @@
   patternsfile: "patterns.ini",
   patternsbackups: 5,
   patternsbackupinterval: 24,
   data_directory: "",
   savestats: false,
   privateBrowsing: false,
   subscriptions_fallbackerrors: 5,
   subscriptions_fallbackurl: "https://adblockplus.org/getSubscription?version=%VERSION%&url=%SUBSCRIPTION%&downloadURL=%URL%&error=%ERROR%&channelStatus=%CHANNELSTATUS%&responseStatus=%RESPONSESTATUS%",
   subscriptions_autoupdate: true,
   subscriptions_exceptionsurl: "https://easylist-downloads.adblockplus.org/exceptionrules.txt",
-  first_run_enable_acceptable_ads: true,
   documentation_link: "https://adblockplus.org/redirect?link=%LINK%&lang=%LANG%",
   update_url_release: "https://update.adblockplus.org/%NAME%/update.json?type=%TYPE%",
   update_url_devbuild: "https://adblockplus.org/devbuilds/%NAME%/update.json?type=%TYPE%",
   update_last_check: 0,
   update_last_error: 0,
   update_soft_expiration: 0,
   update_hard_expiration: 0,
   currentVersion: "0.0",
   notificationdata: {},
   notificationurl: "https://notification.adblockplus.org/notification.json",
   suppress_first_run_page: false,
   disable_auto_updates: false,
-  first_run_enable_current_locale_subscription: true,
+  first_run_subscription_auto_select: true,
   notifications_ignoredcategories: [],
 };
 
 let preconfigurable = ["suppress_first_run_page", "disable_auto_updates",
-  "first_run_enable_acceptable_ads", "first_run_enable_current_locale_subscription"];
+  "first_run_subscription_auto_select"];
 
 let values;
 let path = _fileSystem.resolve("prefs.json");
 let listeners = [];
 let isDirty = false;
 let isSaving = false;
 
 function defineProperty(key)
 {
   Object.defineProperty(Prefs, key,
@@ skipping 81 matching lines @@
     defaults[key] = _preconfiguredPrefs[key];
 
 // Define defaults
 for (let key in defaults)
   defineProperty(key);
 
 // Set values of prefs based on defaults
 values = Object.create(defaults);
 
 load();