Use "uri-reference", not "url" or "uriref"

There is no way to tell a validator that a schema is
using draft-wright-json-schema-validation-00, which is the
only draft with a "uriref" format.  Validators either
interpret schemas as the previous draft (fge-04), which does
not have this concept at all, or the following draft (wright-01)
which has "uri-reference".

Since there are no options that will automatically work correctly,
using the later form seems to be the best.  Many validators allow
registering extensions, and we can just document that we are
using the wright-01+ syntax.  You often need to register format
handlers to get *any* format validation with many validators
anyway, so this does not seem overly burdensome.

schemas/v3.0/schema.yaml

@@ -38,7 +38,7 @@ definitions:
     properties:
       $ref:
         type: string
-        format: uriref
+        format: uri-reference
   Info:
     type: object
     required:
@@ -51,7 +51,7 @@ definitions:
         type: string
       termsOfService:
         type: string
-        format: uriref
+        format: uri-reference
       contact:
         $ref: '#/definitions/Contact'
       license:
@@ -70,7 +70,7 @@ definitions:
         type: string
       url:
         type: string
-        format: uriref
+        format: uri-reference
       email:
         type: string
         format: email
@@ -87,7 +87,7 @@ definitions:
         type: string
       url:
         type: string
-        format: uriref
+        format: uri-reference
     patternProperties:
       '^x-': {}
     additionalProperties: false
@@ -347,7 +347,7 @@ definitions:
         type: string
       namespace:
         type: string
-        format: url
+        format: uri-reference
       prefix:
         type: string
       attribute:
@@ -440,7 +440,7 @@ definitions:
       value: {}
       externalValue:
         type: string
-        format: uriref
+        format: uri-reference
     patternProperties:
       '^x-': {}
     additionalProperties: false
@@ -707,7 +707,7 @@ definitions:
         type: string
       url:
         type: string
-        format: uriref
+        format: uri-reference
     patternProperties:
       '^x-': {}
     additionalProperties: false
@@ -1326,7 +1326,7 @@ definitions:
           - openIdConnect      
       openIdConnectUrl:
         type: string
-        format: url
+        format: uri-reference
       description:
         type: string
     patternProperties:
@@ -1356,10 +1356,10 @@ definitions:
     properties:
       authorizationUrl:
         type: string
-        format: uriref
+        format: uri-reference
       refreshUrl:
         type: string
-        format: uriref
+        format: uri-reference
       scopes:
         type: object
         additionalProperties:
@@ -1375,10 +1375,10 @@ definitions:
     properties:
       tokenUrl:
         type: string
-        format: uriref
+        format: uri-reference
       refreshUrl:
         type: string
-        format: uriref
+        format: uri-reference
       scopes:
         type: object
         additionalProperties:
@@ -1394,10 +1394,10 @@ definitions:
     properties:
       tokenUrl:
         type: string
-        format: uriref
+        format: uri-reference
       refreshUrl:
         type: string
-        format: uriref
+        format: uri-reference
       scopes:
         type: object
         additionalProperties:
@@ -1414,13 +1414,13 @@ definitions:
     properties:
       authorizationUrl:
         type: string
-        format: uriref
+        format: uri-reference
       tokenUrl:
         type: string
-        format: uriref
+        format: uri-reference
       refreshUrl:
         type: string
-        format: uriref
+        format: uri-reference
       scopes:
         type: object
         additionalProperties:
@@ -1439,7 +1439,7 @@ definitions:
     properties:
       operationRef:
         type: string
-        format: uriref
+        format: uri-reference
       parameters:
         type: object
         additionalProperties: {}
@@ -1497,4 +1497,4 @@ definitions:
       allowReserved:
         type: boolean
         default: false
-    additionalProperties: false
+    additionalProperties: false