Add commands for Broker, autosave and clean logging

PlantBox.Broker/PlantBoxesManager.cs

@@ -1,12 +1,13 @@
 using Newtonsoft.Json;
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using System.Text;
 
 namespace PlantBox.Broker
 {
-    class PlantBoxesManager
+    class PlantBoxesManager : IEnumerable<PlantBox>
     {
         public string FilePath => Path.Combine(Environment.CurrentDirectory, FileName);
         public string FileName => "storage.json";
@@ -70,5 +71,17 @@ namespace PlantBox.Broker
 
             Console.WriteLine("Storage saved");
         }
+
+        public void ClearPlantBox(PlantBox plantBox)
+        {
+            if (plantBox != null)
+            {
+                plantBox.HistoricManager.Clear();
+            }
+        }
+
+        public IEnumerator<PlantBox> GetEnumerator() => _plantBoxes.Values.GetEnumerator();
+
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
     }
 }