Exclude [ref] from street names for secondary and lower

[euf]

Right now the "Next Street" string (in the top bar in the navigation mode) includes [ref] part if available. It is also announced with the TTS if it's enabled.

In my experience this both

• looks bad: "[E123] Random Street";
• sounds bad: "Turn right onto E one hundred and twenty three Random Street".

I'd like to propose a better heuristic for building this string.

For highway=secondary, highway=tertiary and all other roads (as well as their links) the [ref] part should be used if and only if there's no regular name present.

This way "[E123] Random Street" inside a city becomes just "Random Street" in OM navigation, but it still would be "[E123]" if there's no common name.

For highway=motorway, highway=trunk, highway=primary keep the things as is (because even if they have a common name, they are still important as a part of a bigger network).

For their links, utilize junction:ref and destination tags instead, as explained in #8457.

Inspired by #3130.

[biodranik]

CC @zyphlar