Add missing types to RFC parser.

parseRFC.js

···
                     this.expectToken(')');
                 }
                 break;
+            case 'UTCTime':
+            case 'GeneralizedTime':
+                break;
             default:
-                x.content = 'TODO:unknown';
+                x.warning = 'type unknown';
             }
         } catch (e) {
             console.log('[debug] parseBuiltinType content', e);
-            x.content = 'TODO:exception';
+            x.warning = 'type exception';
         }
         return x;
     }

rfcdef.js

···
             {
               "id": "utcTime",
               "name": "UTCTime",
-              "type": "builtin",
-              "content": "TODO:unknown"
+              "type": "builtin"
             },
             {
               "id": "generalTime",
               "name": "GeneralizedTime",
-              "type": "builtin",
-              "content": "TODO:unknown"
+              "type": "builtin"
             }
           ]
         }
···
                   "name": "",
                   "type": {
                     "name": "GeneralizedTime",
-                    "type": "builtin",
-                    "content": "TODO:unknown"
+                    "type": "builtin"
                   }
                 }
               ],
···
                   "name": "",
                   "type": {
                     "name": "GeneralizedTime",
-                    "type": "builtin",
-                    "content": "TODO:unknown"
+                    "type": "builtin"
                   }
                 }
               ],
···
         "name": "InvalidityDate",
         "type": {
           "name": "GeneralizedTime",
-          "type": "builtin",
-          "content": "TODO:unknown"
+          "type": "builtin"
         }
       }
     }
···
               "id": "date",
               "name": "GeneralizedTime",
               "type": "builtin",
-              "content": "TODO:unknown",
               "optional": true
             },
             {
···
               "id": "date",
               "name": "GeneralizedTime",
               "type": "builtin",
-              "content": "TODO:unknown",
               "optional": true
             },
             {
···
             {
               "id": "utcTime",
               "name": "UTCTime",
-              "type": "builtin",
-              "content": "TODO:unknown"
+              "type": "builtin"
             },
             {
               "id": "generalTime",
               "name": "GeneralizedTime",
-              "type": "builtin",
-              "content": "TODO:unknown"
+              "type": "builtin"
             }
           ]
         }
···
             {
               "id": "genTime",
               "name": "GeneralizedTime",
-              "type": "builtin",
-              "content": "TODO:unknown"
+              "type": "builtin"
             },
             {
               "id": "accuracy",
···
                   "name": "",
                   "type": {
                     "name": "GeneralizedTime",
-                    "type": "builtin",
-                    "content": "TODO:unknown"
+                    "type": "builtin"
                   }
                 }
               ],
···
             {
               "id": "willBeRevokedAt",
               "name": "GeneralizedTime",
-              "type": "builtin",
-              "content": "TODO:unknown"
+              "type": "builtin"
             },
             {
               "id": "badSinceDate",
               "name": "GeneralizedTime",
-              "type": "builtin",
-              "content": "TODO:unknown"
+              "type": "builtin"
             },
             {
               "id": "crlDetails",