Add the possibility to lock the buttons

[NavyCS]

Add the possibility to lock the buttons to avoid pressing any button accidentally, such as for use in motion control games like Just Dance. It can have a slider to be able to unlock the buttons. Being able to turn off the screen would also be very good.

[breeze2]

OK, I will implement it in next version.

[breeze2]

Please try version 2.3.0, long press the menu icon, it will lock the buttons