Ported the old tab renaming code into main

Needs to be cleaned up

MatterControlLib/Library/Providers/FileSystem/MockLibraryItem.cs

@@ -46,6 +46,19 @@ namespace MatterHackers.MatterControl.Library
 
 		public bool IsVisible => true;
 
-		public string Name { get; set; }
+		private string _name;
+		public string Name
+		{
+			get => _name; set
+			{
+				if (_name != value)
+				{
+					_name = value;
+					NameChanged?.Invoke(this, EventArgs.Empty);
+				}
+			}
+		}
+
+		public event EventHandler NameChanged;
 	}
 }