Lots of SzGui work

SzCore/SzDataHandler.cs

@@ -7,6 +7,9 @@ public class SzDataHandler
     private readonly Dictionary<string, SzDataset> _loadedDatasets = [];
     private readonly Dictionary<string, ISzTemplate> _loadedTemplates = [];
 
+    public Dictionary<string, SzDataset> LoadedDatasets => _loadedDatasets;
+    public Dictionary<string, ISzTemplate> LoadedTemplates => _loadedTemplates;
+
     public SzDataHandler() { }
 
     public void ClearCache()
@@ -247,5 +250,18 @@ public class SzDataHandler
             await LoadDatasetAsync(id, ct);
         }
     }
+
+    public async Task LoadAllDataObjectTemplatesAsync(CancellationToken ct = default)
+    {
+        _loadedTemplates.Clear();
+        if (!Directory.Exists(SZ.LocalFileManager.TemplatesPath)) return;
+        
+        var dirs = Directory.GetDirectories(SZ.LocalFileManager.TemplatesPath);
+        foreach (var dir in dirs)
+        {
+            var id = Path.GetFileName(dir);
+            await LoadTemplateAsync<SzDataObjectTemplate>(id, ct);
+        }
+    }
     #endregion
 }