Feature/#423 nonop way classification

Created by: das-g

closes #423 (closed)

we only handle

• <main tag key>=<status>+<status>=<main tag value>, e.g. highway=construction+construction=tertiary
• <main tag key>=<status>, e.g. highway=construction (using the fallback sub_types in this case)

There are more lifecycle tagging schemes, most notable lifecycle prefix (<status>:<main tag key>=<main tag value>, e.g. construction:highway=tertiary) that we didn't handle before this PR and don't handle with it (yet), either.

Reviewed by

• @hixi
• @sfkeller