[BUG] OMT Basemap generates transportation_name entry for minor roads

[boldtrn]

Describe the bug

Planetiler creates a transportation_name entry with a ref for minor roads. This differs to OMT. I have a style that shows road signs. It now shows road signs for hiking and cycling routes.

To Reproduce
Steps to reproduce the behavior:

1. Compare OMT tiles to Planetiler OMT.

For example:
https://www.openstreetmap.org/relation/2268453
https://www.openstreetmap.org/relation/1153402

Expected behavior

I don't think it's an issue that Planetiler does this. There are applications that want to show highway signs for cycle routes etc. At least I think we should document it. That way, I know what I am getting and can update my styles to consider this change.

Screenshots

OMT vs Planetiler:

[wipfli]

Interesting, is it maybe that transportation_name should only create a feature if name is present?

[boldtrn]

I am actually not 100% sure what the base logic in OMT is to create the ref. I assume it has to be a road of tertiary or higher. If there is a ref attached to a road, showing a road sign is good, even though the road has no name.

Just to make sure: I think it's not an issue that Planetiler behaves like this, as I could imagine scenarios where people need this info. It slightly breaks OMT compatibility.

[wipfli]

@ZeLonewolf?

[msbarry]

I think I see the issue, it should only use ref tags from major networks, not minor ones. Put out a fix for this and #145 in #148

[msbarry]

In #148 I'm making the default behavior match openmaptiles, but you can opt-into the old behavior with the --transportation-name-minor-refs flag.

[msbarry]

Fixed in #148