Remove ymodem flashing

[keeramis]

Description

ymodem flashing is replaced using CLI local flashing over USB (which uses DFU and Control requests)

How to Test

I will provide some examples here but kindly think of any creative ways that users would use particle serial flash or particle flash --serial command!

1. Checkout this branch. Install dependencies.
2. particle serial flash
   • npm start -- serial flash /path/to/file.bin with single device
   • npm start -- serial flash /path/to/file.bin with multiple devices
   • npm start -- serial flash /path/to/file.bin --port /port/num/of/device
3. particle flash --serial
   • npm start -- flash --serial /path/to/file.bin with single device
   • npm start -- flash --serial /path/to/file.bin with multiple devices
   • npm start -- flash --serial /path/to/file.bin --port /port/num/of/device

Related Issues / Discussions

https://app.shortcut.com/particle/epic/124394 https://app.shortcut.com/particle/story/124692/remove-ymodem-from-cli

Completeness

• [x] User is totes amazing for contributing!
• [x] Contributor has signed CLA
• [x] Problem and solution clearly stated
• [x] Tests have been provided
• [x] Docs have been updated
• [x] CI is passing

[keeramis]

@monkbroc Thanks for the clean up and the changes. I have one question for you. Over here - https://github.com/particle-iot/particle-cli/blob/feature/ep-124394/remove-ymodem-flashing/src/cmd/flash.js#L53 We are still calling this function flashYModem which gives the wrong idea because we removed ymodem flashing completely, and under-the-hood, it calls flashDevice now. Why can't we make it call flashDevice directly?