Fix category visibility toggle

[mxgrey]

Toggling visibility for lanes off and then on again will show all lanes, no matter what level they should be on. This is a problem for multi-level sites.

We should fix this by using something similar to VisibilityDependents to track reasons for the lanes to be visible or not visible, e.g. there can be a field for category visibility and level visibility where both must be true for the lane to be visible.