PoElli 1.0 parts

Parts which PoElli-1.0 uses.

Ethernet connector 1888250-x should be discussed. Connector is done as manufacturer recommends, but it has too high insertion force in my subjective opinion. Signal lines could benefit from larger drill.

This pull request also includes plenty of earlier development, including fixing shield template drills etc.

Careful verification of parts is highly recommended before merging.