FemtoBeacon ESP32 coin

https://github.com/micropython/micropython/issues/4986

 Thanks to a ton of community support, I've managed to get MicroPython working on the ESP32-D2WD, which only has 2MiB of internal SPI flash.

Have a look at my official pull request!

I'm in the process of getting a small batch of coins fabricated. They will be available on Tindie shortly. In the meantime, maybe add yourself to the wish list? https://www.tindie.com/products/femtoduino/femtobeacon-esp32-d2wd-wifibluetooth-coin/

I've tested the wireless functionality of my FemtoBeacon ESP32-D2WD coin. WiFi and Bluetooth pass with flying colors. Ready to order a medium run of @oshpark PCBs. Parts are ordered, and a quote request has been submitted to Small Batch Assembly for the first batch of 100 coins.