switch to the OSM2VectorTiles successor OpenMapTiles

[rastapasta]

The current implementation is still built around the now deprecated osm2vectortiles - so let's switch it to its successor OpenMapTiles!

Things to do:

• [ ] adapt Renderer._generateDrawOrder to the new Tile Schema
• [ ] adapt styles or fork & adapt the OpenMapTiles ones for console usage
• [x] setup a server to serve the Planet MBTiles