Convert flags to singleton

src/user/FeatureFlags.ts

@@ -16,7 +16,7 @@ export default class FeatureFlags {
         return FeatureFlags.instance
     }
 
-    constructor(private datastore: DataStore) {
+    private constructor(private datastore: DataStore) {
         this.refreshFeatureFlags()
         const self = this
         self.featureFlags = self.datastore.getFeatureFlags()

src/user/UserManager.ts

@@ -19,7 +19,7 @@ export class UserManager {
         this.datastore = DataStoreProvider.getDataStore(namespace)
         this.proManager = new ProManager(
             this.datastore.getProDataStore(),
-            new FeatureFlags(this.datastore)
+            FeatureFlags.get(this.datastore)
         )
         this.eventLogger = EventLoggerFactory.get(this.proManager).getLogger()
         this.serviceManager = ServiceManager.get(

src/user/system/CaptainManager.ts

@@ -259,7 +259,7 @@ class CaptainManager {
                 EventLoggerFactory.get(
                     new ProManager(
                         self.dataStore.getProDataStore(),
-                        new FeatureFlags(this.datastore)
+                        FeatureFlags.get(this.datastore)
                     )
                 )
                     .getLogger()
@@ -483,7 +483,7 @@ class CaptainManager {
                     EventLoggerFactory.get(
                         new ProManager(
                             self.dataStore.getProDataStore(),
-                            new FeatureFlags(this.datastore)
+                            FeatureFlags.get(this.datastore)
                         )
                     ).getLogger(),
                     CaptainManager.get().getDomainResolveChecker()