cncjs / cncjs / 3673 / 4

85%

master: 85%

Pull #512

travis-ci

Print unprintable characters as hex in console

The console shows the bytes sent on the serial port.  Some of the
GRBL realtime commands use unprintable characters, for example
the jog cancel command is 0x85.  Convert the unprintable characters
to hex when printing to the console widget.

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