[WIP] SEO: Add location information from PL Y,X,zoom

This injects location data based on Y, X and zoom values of the permlink. The below only happens when zoom is >= 5.

add all results of an identify request @ Y, X with following layers (pixel tolerance 10 pixels):
- 'ch.swisstopo-vd.ortschaftenverzeichnis_plz'
- 'ch.swisstopo.swissboundaries3d-gemeinde-flaeche.fill'
- 'ch.swisstopo.swissboundaries3d-bezirk-flaeche.fill'
- 'ch.swisstopo.swissboundaries3d-kanton-flaeche.fill'

add x number of closest results from search request with bounding box of 4km`2 around Y,X with following layers)
- 'ch.swisstopo.vec200-names-namedlocation' -> x = 3
- 'ch.bfs.gebaeude_wohnungs_register' -> x = 1

Don't merge for tomorrow :)