Add lane highlight to Parking Restrictions tool

[originalfoo]

While not immediately obvious, a lane highlight still useful for this tool as it has an "apply to route" mode (Shift+Click) so good to highlight the affected route!

This is already done, by accident lol (see #682 (comment))... just creating issue to track it separtely and ensure it appears in the change notes.

[originalfoo]

@kianzarrin This would be a good time to check what's happening with #516 - seems one way roads, even if they have two parking lanes, only get one parking icon. As user I have no idea if it affects both lanes or just one, and ideally want separte control over each lane.

Also tagging #667

[kianzarrin]

For the sake of thoroughness I tested roads with different prefab that do not produce junctions (because they have matching lanes):


I tested and confirmed that the overlay accurately shows what parking signs will be affected.

[kianzarrin]

The latter screenshot is not right

[originalfoo]

Ref #33