ui: add shortcut for adding quick settings tile

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

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

@@ -185,6 +185,10 @@
     <string name="private_key">Private key</string>
     <string name="public_key">Public key</string>
     <string name="qr_code_hint">Tip: generate with `qrencode -t ansiutf8 &lt; tunnel.conf`.</string>
+    <string name="quick_settings_tile_add_title">Add tile to quick settings panel</string>
+    <string name="quick_settings_tile_add_summary">The shortcut tile toggles the most recent tunnel</string>
+    <string name="quick_settings_tile_add_failure">Unable to add shortcut tile: error %d</string>
+    <string name="quick_settings_tile_action">Toggle tunnel</string>
     <string name="restore_on_boot_summary_off">Will not bring up enabled tunnels at boot</string>
     <string name="restore_on_boot_summary_on">Will bring up enabled tunnels at boot</string>
     <string name="restore_on_boot_title">Restore on boot</string>

ui/src/main/res/xml/preferences.xml

@@ -12,6 +12,7 @@
         android:summaryOn="@string/restore_on_boot_summary_on"
         android:title="@string/restore_on_boot_title" />
     <com.wireguard.android.preference.ZipExporterPreference android:key="zip_exporter" />
+    <com.wireguard.android.preference.QuickTilePreference android:key="quick_tile" />
     <Preference
         android:key="log_viewer"
         android:singleLineTitle="false"