Draw even more icons

[nvkelso]

These aren't in tiles yet, so slipping off into new task.

• rest_area - will be in v1.0 tiles (Add highway=rest_area and highway=services (area=yes) tilezen/vector-datasource#480)
• horse – for stable and for horse exercise areas, kinda Add orphan sport pitch POIs tilezen/vector-datasource#669.
• fire_lookout blocked on Add fire lookout and fee station outdoor pois tilezen/vector-datasource#726.
• fee_station blocked on Add fire lookout and fee station outdoor pois tilezen/vector-datasource#726.