Revise AddToQueueFromLibraryButtonAddsItemToQueue test

- Restore Add To Queue functionality
- Expose reusable AddAllItems() to PrintQueueCollection
- Revise base implementation of FileSystemItem to support default
  name based on filename unless set

Library/Providers/FileSystem/FileSystemItem.cs

@@ -62,7 +62,10 @@ namespace MatterHackers.MatterControl.Library
 
 				return fileName;
 			}
-			set { }
+			set
+			{
+				fileName = value;
+			}
 		}
 	}
 }

Library/Providers/MatterControl/PrintQueueContainer.cs

@@ -64,6 +64,13 @@ namespace MatterHackers.MatterControl.Library
 		}
 
 		public override async void Add(IEnumerable<ILibraryItem> items)
+		{
+			await AddAllItems(items);
+
+			this.ReloadContainer();
+		}
+
+		public static async Task AddAllItems(IEnumerable<ILibraryItem> items)
 		{
 			await Task.Run(async () =>
 			{
@@ -98,8 +105,6 @@ namespace MatterHackers.MatterControl.Library
 							0);
 					}
 				}
-
-				this.ReloadContainer();
 			});
 		}
 
@@ -110,7 +115,7 @@ namespace MatterHackers.MatterControl.Library
 				var fileSystemItem = item as FileSystemFileItem;
 				if (fileSystemItem != null)
 				{
-					var matches = QueueData.Instance.PrintItems.Where(p => p.FileLocation == fileSystemItem.Path);
+					var matches = QueueData.Instance.PrintItems.Where(p => p.FileLocation == fileSystemItem.Path).ToList();
 
 					foreach(var printItem in matches)
 					{

Library/Widgets/PrintLibraryWidget.cs

@@ -740,18 +740,13 @@ namespace MatterHackers.MatterControl.PrintLibrary
 			});
 		}
 
-		private void addToQueueButton_Click(object sender, EventArgs e)
+		private async void addToQueueButton_Click(object sender, EventArgs e)
 		{
-			foreach (var item in libraryView.SelectedItems)
+			var selectedItems = libraryView.SelectedItems.Select(o => o.Model);
+			if (selectedItems.Any())
 			{
-				throw new NotImplementedException("addToQueueButton_Click");
-
-				// Get content
-				// Create printitemwrapper (or not) - an implementation for this exists in cloud library
-				// Add printitemwrapper to queue
+				await PrintQueueContainer.AddAllItems(selectedItems);
 			}
-
-			libraryView.SelectedItems.Clear();
 		}
 
 		private void EnableMenus()