boot without connection & only print disconnected once #49
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fixes #43
fixes #14
Track whether a connection is currently active. Only print connect/disconnect on the state change.
On boot, run the 'reconnect' routine, which is essentially just connect that doesn't quit.
NB: I made the CLI options
sys.exit(1)
if no crow is found on boot because they would otherwise just load into the REPL if no device was found which seems incorrect behaviour for a CLI tool. Instead it returns with an errorcode and tells the user there's no crow detected.