Create shorthand for iface declaration

[ceremcem]

Following iface declaration:

iface: "c2.a1"
netlist:
    "foo": "c5.1 c2.a1 

should expand to:

iface: "a1"
netlist:
    "foo": "c5.1 c2.a1 a1"

Use case

This is useful for creating sub-circuits for bundling components with their necessary components. In order not to create a mess with re-declaration of Component.iface inside the sub-circuit, the "Unused pads" can be simply placed in iface section of sub-circuit.

[ceremcem]

Closed by 838b0a9