Working on data and sztl

SessionZero/Data/Sztl/SzFieldGroup.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace SessionZero.Data.Sztl;
+
+public class SzFieldGroup
+{
+    public string Id { get; set; }
+    public Dictionary<string, SzField> Fields { get; set; } = new();
+    public Dictionary<string, SzFieldGroup> SubGroups { get; set; } = new();
+}