Implement custom permission system for plugins

plugins/sdk/src/main/AndroidManifest.xml

@@ -0,0 +1,13 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application>
+        <activity
+            android:name=".permissions.RequestPermissionActivity"
+            android:exported="true"
+            android:theme="@android:style/Theme.DeviceDefault.Dialog.NoActionBar.MinWidth">
+            <intent-filter>
+                <action android:name="de.mm20.launcher2.plugin.REQUEST_PERMISSION" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>