Update data centre details

Add quarter marker for Mertonviertel, since it is a recognised area with a name, and doesn't seem to have a place marker yet.

Small service building

Reposition steps. They are definitely not as close to the Raststätte as they were positioned on the map before.

Reverse guard rail; right side should be inside according to wiki. Complete the path from Raststätte to tunnel

Add Westside Café

School yard running track

add rubbish bin

Better building outlines

Clarify that parking aisle is not accessible from other side except by foot

Senioren-Sportanlage bounds, entrances, and surrounding trees

Service building and table tennis tables

Improve farmland outline, add some park trees

Better described as a basin.

Parking, footpath, and some trees

Under-bridge path positioning tweaks

KGV outline and parking

Improve path positioning

Better building positioning, add some new ones

Combine buildings that are really part of the same building