Order layers properly (top -> bottom)

[seveibar]

In the future, the render order is configurable (because someone might want to look at the bottom or an inner layer, and this would be specified in the options)

In this screenshot the blue should be under the red component, since the red component is on top.

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[homie-gg]

This might have already been done via: fix pcb_port layer not matching smtpad.

[homie-gg]

This might have already been done via: add originalLayer to footprint, minor refactor.