Added Terminate Signal #30
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Now when a connection is closed using ctrl + c, a string will be sent via serial with "elf2uf2-term\n\r" This is powerful as now, with this feature, the micro controller can choose to respond to this string by entering boot select. No more plugging and unplugging the microcontroller while holding bootsel.
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Description
This PR adds a termination signal when the serial connection is terminated with ctrl + c with the bytes "elf2uf2-term\n\r"
Motivation
It is annoying to either unplug and replug the mico controller while holding down the bootsel button to enter boot select mode or construct a circuit in which the ground and run pin are connected to enter boot select mode. So, it would be nice if the serial connection indicated that it would terminate. That way, it would be easier to enter boot select mode programmatically.