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This commit adds the "--escape-non-printable" option to the repl command. When specified the REPL console will escape non-printable characters, printing them as their hex value in square brackets. This escaping behaviour was previously the default and only behaviour, but it is now opt-in. As part of this change, the speed of echoing device data to the console is improved by by reading and writing in chunks. Signed-off-by: Damien George <damien@micropython.org>