Add connectors by admin-portal rules or manually

Add connectors either by defining a rule in the admin portal so matching imported cabinets get the rule's connectors automatically, or by adding them manually.

1. There are two ways to add connectors: define a rule in the admin portal so any imported cabinet matching the rule automatically gets the rule's connectors, or add connectors manually.

2. When rules are set up correctly, all applied connectors should come from rules; use the scenario rule applicability filter set to 'manual' to detect any stray manually added connectors.

3. Hardware for a newly created custom scenario is not populated from rules; the correct connector must be added manually via add connector on the scenario.

4. In the connectors view, use the scenario rule applicability filter (the last filter on the left side) and set it to 'rule', then click 'check for collision' in the bottom-right corner to detect connector collisions.