1Sheeld: The Arduino Shield

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- Supported Android Nougat (v7.0), and fixed a bug where it didn't connect or disconnect sometimes.
- Handled a bug where any files opened using a external app crashes our app.
- Made the text to speech shield use the current locale for speaking.
- Integrated Firebase for push notifications.
- Changed our old logo with the brand new one.
- Increased app stability and fixed minor bugs.