SOLOLINK: Robust FW upload, ChibiOS compatibility, new uploader.py

[Pedals2Paddles]

These changes all revolve around compatibility loading modern ArduPilot firmware. In the last year, ArduPilot has moved away from the old px4 related stuff and moved on to a new RTOS called ChibiOS. There were also some outstanding error handling issues to correct from back in the day. Short summary:

• Add compatibility for new ArduPilot firmware file type (*.apj). Will still load older *.px4 files too.
• Added error handling to ArduPilot FW loading scripts. Firmware failing to load will delete itself to prevent Solo from being stuck in a never ending loop you can't escape without factory resetting
• Add compatibility for new ArduPilot ChibiOS RTOS that replaces nuttx. Changes USB device ID and some other bits
• Replace old px_uploader.py with the new ArduPilot uploader.py.
• Misc boot logging enhancements for easier troubleshooting

[Pedals2Paddles]

Closing. Superceeded by consolidated repo in progress