Add ref:edubase for schools, etc in the UK (#1000)

data/presets/amenity/college.json

@@ -12,6 +12,7 @@
         "{@templates/internet_access}",
         "{@templates/poi}",
         "denomination",
+        "ref/edubase-GB",
         "religion"
     ],
     "geometry": [

data/presets/amenity/kindergarten.json

@@ -13,6 +13,7 @@
         "capacity",
         "fhrs/id-GB",
         "gnis/feature_id-US",
+        "ref/edubase-GB",
         "internet_access",
         "internet_access/ssid",
         "level",

data/presets/amenity/school.json

@@ -19,6 +19,7 @@
         "fee",
         "fhrs/id-GB",
         "gnis/feature_id-US",
+        "ref/edubase-GB",
         "internet_access",
         "internet_access/ssid",
         "level",