ProfileService: Add a listener to start it on boot

This will allow automatically starting profiles on boot.

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

app/src/main/AndroidManifest.xml

@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.wireguard.android">
+    package="com.wireguard.android"
+    android:installLocation="internalOnly">
+
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 
     <application
         android:allowBackup="false"
@@ -17,6 +20,12 @@
             </intent-filter>
         </activity>
 
+        <receiver android:name=".BootCompletedReceiver">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
+
         <service
             android:name=".ProfileService"
             android:exported="false" />