Power supply items

[effreek]

Copied from discussion in discord so we don't loose sight.

@iromero91 noted the following:

For internal supply:

• VH to ferrule harness
• din power supply
• ferrule to spade terminal harness
• panel mount IEC socket
• iec cable with the national plug for an internal supply

For an external supply it would be:

• VH to VH harness
• Bulkhead PCB
• External power supply with the correct national plug