implement flows runtime stop/start API and UI

packages/node_modules/node-red/settings.js

@@ -242,6 +242,7 @@ module.exports = {
 /*******************************************************************************
  * Runtime Settings
  *  - lang
+ *  - runtimeState
  *  - diagnostics
  *  - logging
  *  - contextStorage
@@ -267,7 +268,19 @@ module.exports = {
         /** enable or disable diagnostics display in the node-red editor. Must be set to `false` to disable */
         ui: true,
     },
-
+    /** Configure runtimeState options 
+     * - enabled:  When `enabled` is `true` (or unset), runtime Start/Stop will
+     *   be available at http://localhost:1880/flows/state  
+     * - ui: When `ui` is `true` (or unset), the action `core:start-flows` and 
+     *   `core:stop-flows` be available to logged in users of node-red editor
+     *   Also, the deploy menu (when set to default) will show a stop or start button
+    */
+    runtimeState: {
+        /** enable or disable flows/state endpoint. Must be set to `false` to disable */
+        enabled: true,
+        /** show or hide runtime stop/start options in the node-red editor. Must be set to `false` to hide */
+        ui: true,
+    },
      /** Configure the logging output */
      logging: {
          /** Only console logging is currently supported */