feat(AndroidManifest): explicitly define the activity attribute android:exported (#1372)

Author: erisu

templates/project/AndroidManifest.xml

@@ -37,7 +37,8 @@
                 android:launchMode="singleTop"
                 android:theme="@style/Theme.AppCompat.NoActionBar"
                 android:windowSoftInputMode="adjustResize"
-                android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|smallestScreenSize|screenLayout|uiMode">
+                android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|smallestScreenSize|screenLayout|uiMode"
+                android:exported="true">
             <intent-filter android:label="@string/launcher_name">
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />