Small Qi charger box

Minimal size Qi charger box.
Uses a cheap and easily available Qi charger PCB+antenna kit:
[from Aliexpress](https://www.aliexpress.com/item/New-Wireless-Charging-Accessories-Qi-Wireless-Charger-PCBA-Circuit-Board-With-Qi-Standard-Coil-DIY-UQIP25/32728153505.html)
[from BangGood](http://www.banggood.com/Qi-Wireless-Charger-PCBA-Circuit-Board-Coil-Charging-p-1000423.html)

Make sure your antenna ferrite disc is about 49.8mm in diameter (see "coilShieldX" value in source file).
When installi