Autumn release of OAM World maps is online

[michaelbechtold]

These are the news:
- The complete OAM background for ZL 8 and above is now based on Christian's October 2025 OAM vector maps release.
- After one and a half years, the selection and prioritization of settlements (cities, towns, villages, etc.) was recalculated once again.
  As settlements are increasingly defined as relations in OSM, but in an inconsistent manner (even inside one country, let alone between different countries ...), an extension of the algorithm was necessary ("Why is Grävenwiesbach missing in ZL 9?" was my eye-opener for the problem). And there were many more to be fixed.
- In summer 2025 Vietnam changed its province structure - the capital layer has been adapted accordingly.