Fixes #30, added quick settings icon. (#32)

* Fixes #30, added quick settings icon.
* Added saving of enabled state, added some fixes and refactorings.
* Fixed a bug with turning on/off the VPN.
* Fixed possibility to add duplicate servers in DNS settings.

app/src/main/res/drawable/ic_tile_icon.xml

@@ -0,0 +1,14 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="480dp"
+    android:height="480dp"
+    android:viewportWidth="480"
+    android:viewportHeight="480">
+  <path
+      android:pathData="m58.51,474.95c1.37,-5.62 17.69,-45.43 32.05,-78.2c14.7,-33.54 14.42,-32.23 10.32,-49.01c-5.11,-20.95 -4.8,-55.06 0.67,-73.17c19.73,-65.38 70.97,-109.69 182.24,-157.59c36.24,-15.6 56.14,-25.61 71.24,-35.83c26.61,-18.01 54.3,-49.27 63.15,-71.29c1.87,-4.65 3.96,-8.4 4.66,-8.35c2.18,0.16 1.1,66.01 -1.46,88.95c-15.82,142.09 -64.01,234.52 -143.35,274.93c-45.79,23.32 -117.97,31.97 -151.59,18.15c-4.75,-1.95 -9.76,-3.55 -11.12,-3.55c-5.12,0 -23.48,49.02 -28.75,76.76c-1.64,8.61 -4.12,20.42 -4.48,22.23c-8.2,-0.06 -0.53,-0.02 -12.19,-0.02l-12.36,0z"
+      android:strokeLineJoin="miter"
+      android:strokeWidth="1.49"
+      android:fillColor="#FFFFFF"
+      android:fillType="nonZero"
+      android:strokeColor="#00000000"
+      android:strokeLineCap="butt"/>
+</vector>

app/src/main/res/values-ru/strings.xml

@@ -22,8 +22,9 @@
     <string name="dns_one_server">1 сервер</string>
     <string name="dns_many_servers">%d сервера/серверов</string>
     <string name="dns_remove_title">Убрать %s?</string>
-    <string name="main_no_connectivity">Нет подключения</string>
-    <string name="main_enabled">Включено</string>
+    <string name="dns_already_added_server">Этот сервер уже добавлен.</string>
+    <string name="main_no_connectivity">Включено (Нет подключения)</string>
+    <string name="main_enabled">Подключено</string>
     <string name="main_disabled">Выключено</string>
     <string name="main_no_peers">Нет пиров</string>
     <string name="main_one_peer">1 пир</string>
@@ -65,8 +66,13 @@
     <string name="public_key_hint">Ваш публичный ключ идентифицирует вас в сети. Его распространение безопасно.</string>
     <string name="reset_configuration">Сбросить настройки</string>
     <string name="reset_configuration_hint">Сброс создаст полностью новые настройки. Это изменит ваш публичный ключ и адрес IP.</string>
+    <string name="tile_disabled">Выключено</string>
+    <string name="tile_enabled">Включено (Нет подключения)</string>
+    <string name="tile_connected">Подключено</string>
     <string name="location_amsterdam">Амстердам, Нидерланды</string>
     <string name="location_prague">Прага, Чехия</string>
     <string name="location_bratislava">Братислава, Словакия</string>
     <string name="location_buffalo">Баффало, США</string>
+    <string name="channel_name">Сервис VPN</string>
+    <string name="channel_description">Главный канал нотификаций сервиса</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -22,8 +22,9 @@
     <string name="dns_one_server">1 server</string>
     <string name="dns_many_servers">%d server</string>
     <string name="dns_remove_title">Remove %s?</string>
-    <string name="main_no_connectivity">No connectivity</string>
-    <string name="main_enabled">Enabled</string>
+    <string name="dns_already_added_server">This server is already added.</string>
+    <string name="main_no_connectivity">Enabled (No connectivity)</string>
+    <string name="main_enabled">Connected</string>
     <string name="main_disabled">Not enabled</string>
     <string name="main_no_peers">No peers</string>
     <string name="main_one_peer">1 peer</string>
@@ -65,8 +66,13 @@
     <string name="public_key_hint">Your public key forms your identity on the network. It is safe to be shared.</string>
     <string name="reset_configuration">Reset configuration</string>
     <string name="reset_configuration_hint">Resetting will overwrite with newly generated configuration. Your public keys and IP address on the network will change.</string>
+    <string name="tile_disabled">Disabled</string>
+    <string name="tile_enabled">Enabled (No connectivity)</string>
+    <string name="tile_connected">Connected</string>
     <string name="location_amsterdam">Amsterdam, NL</string>
     <string name="location_prague">Prague, CZ</string>
     <string name="location_bratislava">Bratislava, SK</string>
     <string name="location_buffalo">Buffalo, US</string>
+    <string name="channel_name">VPN Service</string>
+    <string name="channel_description">Main channel for foreground notification</string>
 </resources>