Enable loading order and premilling-by-side in sticker template

Turn on loading order and premilling by side in the sticker template so the sticker shows which side faces up and the premilling value per edge.

1. In the sticker template settings, switch on 'loading order' so the sticker indicates which side of the panel faces up during loading.

2. Also switch on 'premilling by side' to show the premilling value for each edge.

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3. The premilling information itself should not appear on the sticker because premilling happens after cutting.

4. Set the premilling value (e.g. 1-1-1-1) for all sides as required.

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5. Panel Labels includes a Loading Order field that can be mapped to a label slot, so the loading order of panels can be printed on the label rather than inferred from the panel's finish.