Add more fields to the tourism=camp_site preset (close #7169)

Add Backcountry Camping Area and Group Camping Area presets
Add Hot Water field to the Shower preset
Deprecate low usage `showers` tag in favor of `shower`

data/deprecated.json

@@ -965,6 +965,10 @@
       "old": {"shop": "winery"},
       "replace": {"craft": "winery"}
     },
+    {
+      "old": {"showers": "*"},
+      "replace": {"shower": "$1"}
+    },
     {
       "old": {"sloped_curb": "0"},
       "replace": {"kerb": "flush"}