Brightness Slider Control

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Added a donation option.

Previous change logs:
Now touching 0% level and 100% level has become extremely easy.
Performance is greatly improved.

Now you can choose whether to show the notification automatically on boot.
A new button is added in the app to remove the notification.

Now you can choose whether to show icon in status bar or not!
The notification will not be cancelled when you press the "Clear All" button.
Fixed the permissions issue on Marshmallow devices.