Add shutter mechanism hardware under shutter system construction

Add shutter mechanisms such as gas lift-up or rolling shutter mechanisms and use them in shutter system construction so pricing and BOQ follow.

1. Shutter mechanisms (such as gas lift-up or rolling shutter mechanisms) are not added under Connectors: Connectors' sub-categories are fittings such as joint clips, carcass connectors, screws and shelf pins. Shutter Mechanisms is a Hardware family of its own, next to Connectors: in the admin catalogue, a Hardware category's Add From Warehouse lists it with its sub-categories (Lift-up, Rolling Shutter, Connectors) and their groups to bring in.

2. Then in shutter system construction, use add shutter mechanism hardware and select the mechanism.

3. Pricing and BOQ follow from this setup.