Chris Pepper 4ab433d391 Fix binary protocol with one serial port (#13270) ...

- The `sdcard.transfer_port` variable is Marlin's internal serial port index, not the physical serial port number.
- Added packet number to "ok" response so hosts don't need to wait for the ACK.
- Renamed feature to `BINARY_FILE_TRANSFER`, as the speed up is only consequential to the ability to transfer binaries over serial.

2019-02-27 19:57:48 -06:00

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