Openapi Schema improvements

- Return proper booleans in api responses
- Update jsonschemavalidation to latest draft

backend/lib/access/permissions.json

@@ -1,5 +1,4 @@
 {
-	"$schema": "http://json-schema.org/draft-07/schema#",
 	"$id": "perms",
 	"definitions": {
 		"view": {