Adapt capacity tags for camp sites etc. (#107)

* 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>

data/presets/tourism/camp_site.json

@@ -5,7 +5,9 @@
         "operator",
         "address",
         "access_simple",
-        "capacity",
+        "capacity/caravans",
+        "capacity/persons",
+        "capacity/tents",
         "fee",
         "payment_multi_fee",
         "charge_fee"

data/presets/tourism/caravan_site.json

@@ -3,7 +3,7 @@
     "fields": [
         "name",
         "address",
-        "capacity",
+        "capacity/caravans",
         "sanitary_dump_station",
         "power_supply",
         "internet_access",