Add option to turn off masquerade

It turns out that this option may not be necessary but I've already implemented it so just in case.

mobile/src/main/res/drawable/ic_social_people.xml

@@ -0,0 +1,6 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:viewportHeight="24.0" android:viewportWidth="24.0"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android"
+    android:tint="?attr/colorControlNormal">
+    <path android:fillColor="#FF000000" android:pathData="M16,11c1.66,0 2.99,-1.34 2.99,-3S17.66,5 16,5c-1.66,0 -3,1.34 -3,3s1.34,3 3,3zM8,11c1.66,0 2.99,-1.34 2.99,-3S9.66,5 8,5C6.34,5 5,6.34 5,8s1.34,3 3,3zM8,13c-2.33,0 -7,1.17 -7,3.5L1,19h14v-2.5c0,-2.33 -4.67,-3.5 -7,-3.5zM16,13c-0.29,0 -0.62,0.02 -0.97,0.05 1.16,0.84 1.97,1.97 1.97,3.45L17,19h6v-2.5c0,-2.33 -4.67,-3.5 -7,-3.5z"/>
+</vector>

mobile/src/main/res/values-zh-rCN/strings.xml

@@ -57,6 +57,8 @@
     <string name="connected_state_failed">%s (已断开)</string>
 
     <string name="settings_service">服务</string>
+    <string name="settings_service_masquerade">IP 掩蔽</string>
+    <string name="settings_service_masquerade_summary">建议使用广告拦截器与 socksfier 等虚拟 VPN 应用时禁用此选项。</string>
     <string name="settings_service_repeater_oc">Wi\u2011Fi 运行频段 (不稳定)</string>
     <string name="settings_service_repeater_oc_summary">"自动 (1\u201114 = 2.4GHz, 15\u2011165 = 5GHz)"</string>
     <string name="settings_service_repeater_strict">严格模式</string>

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

@@ -60,6 +60,9 @@
     <string name="connected_state_failed">%s (lost)</string>
 
     <string name="settings_service">Service</string>
+    <string name="settings_service_masquerade">IP Masquerade</string>
+    <string name="settings_service_masquerade_summary">Recommended to disable this option for dummy VPNs like
+        ad-blockers and socksifiers.</string>
     <string name="settings_service_repeater_oc">Operating Wi\u2011Fi channel (unstable)</string>
     <string name="settings_service_repeater_oc_summary">Auto (1\u201114 = 2.4GHz, 15\u2011165 = 5GHz)</string>
     <string name="settings_service_repeater_strict">Strict mode</string>

mobile/src/main/res/xml/pref_settings.xml

@@ -6,6 +6,12 @@
             android:key="service.clean"
             android:icon="@drawable/ic_action_settings_backup_restore"
             android:title="@string/settings_service_clean"/>
+        <SwitchPreference
+            android:key="service.masquerade"
+            android:icon="@drawable/ic_social_people"
+            android:title="@string/settings_service_masquerade"
+            android:summary="@string/settings_service_masquerade_summary"
+            android:defaultValue="true"/>
         <SwitchPreference
             android:key="service.repeater.strict"
             android:icon="@drawable/ic_action_pan_tool"