Use App Group for user defaults

Tusker/LocalData.swift

@@ -30,7 +30,20 @@ class LocalData: ObservableObject {
                 ]
             }
         } else {
-            defaults = UserDefaults()
+            defaults = UserDefaults(suiteName: "group.space.vaccor.Tusker")!
+            tryMigrateOldDefaults()
+        }
+    }
+    
+    // TODO: remove me before public beta
+    private func tryMigrateOldDefaults() {
+        let old = UserDefaults()
+        if let accounts = old.array(forKey: accountsKey) as? [[String: String]],
+           let mostRecentAccount = old.string(forKey: mostRecentAccountKey) {
+            defaults.setValue(accounts, forKey: accountsKey)
+            defaults.setValue(mostRecentAccount, forKey: mostRecentAccountKey)
+            old.removeObject(forKey: accountsKey)
+            old.removeObject(forKey: mostRecentAccountKey)
         }
     }
     

Tusker/Tusker.entitlements

@@ -4,6 +4,10 @@
 <dict>
 	<key>com.apple.security.app-sandbox</key>
 	<true/>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.space.vaccor.Tusker</string>
+	</array>
 	<key>com.apple.security.device.audio-input</key>
 	<true/>
 	<key>com.apple.security.device.camera</key>