* Add capacity:* tags for tourism=camp_site.
* Use capacity:caravans for tourism=caravan_site.
* Use distinct capacity tags for tourism=camp_site.
* upgrade capacity fields to regular fields
Co-authored-by: Martin Raifer <martin@raifer.tech>
Similar to `toilets` and `shower`, `drinking_water` would ideally be mapped as a separate node for campsites. However, including this field in the main object is still important to mark sites which do not have drinking water—it's difficult to place a node for a feature that doesn't exist—as well as when the mapper doesn't have time or enough resources to place a drinking water source that does exist as a separate feature.
