Ability to load binary mcx files (that are zips)

MatterControlLib/ApplicationView/ApplicationController.cs

@@ -882,7 +882,10 @@ namespace MatterHackers.MatterControl
 					"Design Apps".Localize(),
 					StaticData.Instance.LoadIcon(Path.Combine("Library", "folder.png")),
 					StaticData.Instance.LoadIcon(Path.Combine("Library", "design_apps_icon.png")),
-					() => this.Library.DesignAppsCollectionContainer));
+					() => this.Library.DesignAppsCollectionContainer)
+                {
+					IsReadOnly = true
+                });
 
 			if (File.Exists(ApplicationDataStorage.Instance.CustomLibraryFoldersPath))
 			{

MatterControlLib/ApplicationView/EditContext.cs

@@ -103,7 +103,7 @@ namespace MatterHackers.MatterControl
 			}
 		}
 
-		internal void Save(IObject3D scene)
+		public void Save(IObject3D scene)
 		{
 			if (!this.FreezeGCode)
 			{

MatterControlLib/Library/Providers/FileSystem/FileSystemContainer.cs

@@ -36,6 +36,8 @@ using MatterHackers.Agg;
 using MatterHackers.Agg.Image;
 using MatterHackers.Agg.Platform;
 using MatterHackers.Agg.UI;
+using MatterHackers.DataConverters3D;
+using MatterHackers.MatterControl.DataStorage;
 
 namespace MatterHackers.MatterControl.Library
 {
@@ -78,6 +80,26 @@ namespace MatterHackers.MatterControl.Library
 			}
 		}
 
+		public override void Save(ILibraryItem item, IObject3D content)
+		{
+			if (item is FileSystemFileItem fileItem)
+			{
+				if (fileItem.FilePath.Contains(ApplicationDataStorage.Instance.LibraryAssetsPath))
+                {
+					// save using the normal uncompressed mcx file
+					base.Save(item, content);
+                }
+				else
+                {
+					// save to a binary mcx file (a zip with a scene.mcx and an assets folder)
+
+					// Serialize the scene to disk using a modified Json.net pipeline with custom ContractResolvers and JsonConverters
+					File.WriteAllText(fileItem.FilePath, content.ToJson());
+					this.OnItemContentChanged(new LibraryItemChangedEventArgs(fileItem));
+				}
+			}
+		}
+
 		public override void SetThumbnail(ILibraryItem item, int width, int height, ImageBuffer imageBuffer)
 		{
 #if DEBUG

Submodules/MatterSlice

@@ -1 +1 @@
-Subproject commit e7992a7dc95711814717f0d72a2cdd306b31720f
+Subproject commit 852f10964058e9179e48da89917c93ad07194486

Submodules/agg-sharp

@@ -1 +1 @@
-Subproject commit 36d15c1a124e28738491f7ebc2cbbe5e0f00dcf7
+Subproject commit 944f9897b7e2adaa9b1de88960d1fbaff24669ad