Preliminary support for Ethernet and NCM tethering

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

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M19,3L4.99,3c-1.11,0 -1.98,0.89 -1.98,2L3,19c0,1.1 0.88,2 1.99,2L19,21c1.1,0 2,-0.9 2,-2L21,5c0,-1.11 -0.9,-2 -2,-2zM19,15h-4c0,1.66 -1.35,3 -3,3s-3,-1.34 -3,-3L4.99,15L4.99,5L19,5v10z"/>
+</vector>

mobile/src/main/res/values-v30/bools.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <bool name="api_ge_30">true</bool>
+</resources>

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

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <bool name="api_ge_30">false</bool>
     <bool name="api_ge_26">false</bool>
     <bool name="api_lt_25">true</bool>
     <bool name="is_day">true</bool>

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

@@ -6,6 +6,7 @@
     * @string/usb_tethering_button_text
     * @string/wifi_hotspot_checkbox_text
     * @string/bluetooth_tether_checkbox_text
+    * @string/ethernet_tether_checkbox_text
   -->
 <resources>
     <string name="app_name">VPN Hotspot</string>
@@ -56,6 +57,8 @@
     <string name="tethering_manage_wifi">Wi\u2011Fi hotspot</string>
     <string name="tethering_manage_wifi_legacy">Wi\u2011Fi hotspot (legacy)</string>
     <string name="tethering_manage_bluetooth">Bluetooth tethering</string>
+    <string name="tethering_manage_ethernet">Ethernet tethering</string>
+    <string name="tethering_manage_ncm">USB tethering (NCM)</string>
 
     <string name="connected_state_incomplete">" (connecting)"</string>
     <string name="connected_state_valid">" (reachable)"</string>