lib: Add foot prints.

Add:
* 3314S-TRIMPOT
* BARREL_JACK-PJ-002AH
* SM2420_fc1
* SM2917
* SOIC-8
* TO220_VERT_GDS
* UNI-PAC4B
nixie-power: Add connector for power switch.
nixie-power: Add initial pcb layout.