Added Cyton Status check

[MouradLachhab]

Added a request for Cyton system status to make sure it is available when connecting.

Note: I have noticed that when closing by usb_serial port, I get a java.lang.InterruptedException. I have tried to catch that error or find how to avoid it without success, so if you have any idea.

didn't read the exception part

[abelfodil]

The exception seems to come from here:

https://github.com/felHR85/UsbSerial/blob/master/usbserial/src/main/java/com/felhr/usbserial/SerialBuffer.java#L72

https://github.com/felHR85/UsbSerial/blob/319cb9de686325dcc2814d7cbb6ed7dd36011183/usbserial/src/main/java/com/felhr/usbserial/SerialBuffer.java#L121

[MouradLachhab]

The exception seems to come from here:

https://github.com/felHR85/UsbSerial/blob/master/usbserial/src/main/java/com/felhr/usbserial/SerialBuffer.java#L72

https://github.com/felHR85/UsbSerial/blob/319cb9de686325dcc2814d7cbb6ed7dd36011183/usbserial/src/main/java/com/felhr/usbserial/SerialBuffer.java#L121

Yea, I've looked into it, and the latest commit for that file was exactly to fix an issue with the thread not stopping when the port was closing:
felHR85/UsbSerial@001e745

But I'm still not sure how I'm supposed to deal with this. As of right now, simply opening the port and closing it right after will trigger this exception.

Note: This exception doesn't crash the app or really have any other consequence, but I don't feel like something like that should be in the app if it can be avoided.