Add control block to restart keyer on inactivity

[hcarter333]

Add a control block that closes everything and restarts the keyer script if there' not activity for five minutes.

Maybe just do a soft reset command. When the Pico wakes back up it should start main.py again.

The keyer occasionally hangs for an unknown reason ( I suspect too many connections that weren't properly closed.) Thi will give it a chance to closer connections.