HERE Maps: allow selecting different tile resoures (like trucktile, streettile, etc)

HERE maps have different tile resources:

• Administrative Labels (alabeltile)
• Base Map Tile (basetile)
• Base Line Map Tile (blinetile)
• Label Tile (labeltile)
• Line Tile (linetile)
• Lines and Labels Tile (lltile)
• Map Tile (maptile)
• Street Tile (streettile)
• Truck Tile (trucktile)
• Truck Only Tile (truckonlytile)
• Extra Base Map Tile (xbasetile)
• Truck No Public Transport Tile (trucknopttile)
• Map No Public Transport Tile (mapnopttile)

(from: https://developer.here.com/documentation/map-tile/dev_guide/topics/resource-base-tile-intro.html)

Though currently we have only one "maptile" hard-coded:

static const QString path("/maptile/2.1/maptile/newest/");

(from https://code.qt.io/cgit/qt/qtlocation.git/tree/src/plugins/geoservices/nokia/qgeotilefetcher_nokia.cpp?h=5.13.2#n131)