Factories for templates and objects, Sztl parsing

SessionZero/Data/SzDataObjectTemplate.cs

@@ -0,0 +1,19 @@
+using System;
+using Tomlyn.Model;
+
+namespace SessionZero.Data;
+
+public class SzDataObjectTemplate : SzTemplate
+{
+    public string DataType { get; set; }
+
+    public override void ParseAdditionalMetaData(TomlTable table)
+    {
+        if (!table.ContainsKey("metadata") || table["metadata"] is not TomlTable metadata) return;
+        
+        if (metadata.TryGetValue("data_type", out var tempTypeVal))
+        {
+            DataType = tempTypeVal?.ToString() ?? throw new Exception("Template missing type metadata");
+        }
+    }
+}