KMB-22 layout

KMB-22 LAYOUT WISHLIST

- [x] add 3rd burnwire
- [x] move usb back ~5mil
- [x] WDT layout changes per Max Slack post 6/26
- [x] Flip microSD around :+1:
- [x] Label DC barrel jack with input voltages
- [x] Add separate 3rd burn wire and label groups
- [x] update MRAM package
- [x] confirm microSD switch and card protrusion
- [x] confirm I_SOLAR readout capability 
