Add constructor for ModelToNifResolver with pre-built indices

Introduces a new constructor to ModelToNifResolver that accepts pre-built FlatTypeIndex and AssetIndex instances, allowing for more flexible initialization and easier testing.

Author: AngeloTadeucci

Maple2.File.Parser/Flat/ModelToNifResolver.cs

@@ -21,6 +21,16 @@ public ModelToNifResolver(M2dReader exportedReader, M2dReader assetMetadataReade
         assetIndex = new Convert.AssetIndex(assetMetadataReader);
     }
 
+    /// <summary>
+    /// Initializes a new instance of the ModelToNifResolver class with pre-built indices.
+    /// </summary>
+    /// <param name="flatIndex">Pre-built FlatTypeIndex</param>
+    /// <param name="assetIndex">Pre-built AssetIndex</param>
+    public ModelToNifResolver(FlatTypeIndex flatIndex, Convert.AssetIndex assetIndex) {
+        this.flatIndex = flatIndex;
+        this.assetIndex = assetIndex;
+    }
+
     /// <summary>
     /// Resolves a model name to its NIF asset name.
     /// </summary>