Sending code to ESP32 slow using EspruinoTools -- says "Set Slow Write = true"

@jugglingcats it would be very cool if you could implement the CLI TCP issue. It should be reasonably straightforward.

In terms of throttling, I guess you'd make the option a drop-down with something like:

• Auto (default)
  
• Force throttling 19 bytes
  
• Force throttling 128 bytes
  
• Force no throttling (with a warning)
  
  

For flow control, you just need to add jshSetFlowControlEnabled to jshUSARTSetup. It's done in software so should work on all platforms (it's just that ESP32/8266 don't expose it). Ideally you'd modify built_platform_config.py to check for a default_console_cts option that then made a DEFAULT_CONSOLE_CTS_PIN definition that the ESP32 initialisation then checked, so it could be tweaked based on the board.