Implement MAC lookup (#68)

* Implement MAC lookup

* Refine error processing

* Use long to store MAC consistently

* Link back to macvendors.co

* Undo some havoc

* Do not show mac spans for TV

* Show MAC and IP in a consistent order

* Add IP spans by ipinfo.io

* Add SpanFormatter

* Fix IPv6 ipinfo.io link

* Refine SpanFormatter

* Fix pressing the link

mobile/src/androidTest/java/be/mygod/vpnhotspot/room/MigrationTest.kt

@@ -0,0 +1,29 @@
+package be.mygod.vpnhotspot.room
+
+import androidx.room.testing.MigrationTestHelper
+import androidx.sqlite.db.framework.FrameworkSQLiteOpenHelperFactory
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.io.IOException
+
+@RunWith(AndroidJUnit4::class)
+class MigrationTest {
+    companion object {
+        private const val TEST_DB = "migration-test"
+    }
+
+    @get:Rule
+    val privateDatabase = MigrationTestHelper(InstrumentationRegistry.getInstrumentation(),
+            AppDatabase::class.java.canonicalName, FrameworkSQLiteOpenHelperFactory())
+
+    @Test
+    @Throws(IOException::class)
+    fun migrate2() {
+        val db = privateDatabase.createDatabase(TEST_DB, 1)
+        db.close()
+        privateDatabase.runMigrationsAndValidate(TEST_DB, 2, true, AppDatabase.Migration2)
+    }
+}