Support multiple ability sources

PkmnLib.Dataloader/AbilityDataLoader.cs

@@ -12,9 +12,8 @@ namespace PkmnLib.Dataloader;
 
 public static class AbilityDataLoader
 {
-    public static AbilityLibrary LoadAbilities(Stream stream)
+    private static Dictionary<string, SerializedAbility> LoadAbilitiesData(Stream stream)
     {
-        var library = new AbilityLibrary();
         var obj = JsonSerializer.Deserialize<JsonObject>(stream);
         if (obj == null)
             throw new InvalidDataException("Ability data is empty.");
@@ -28,13 +27,34 @@ public static class AbilityDataLoader
             });
         if (objects == null)
             throw new InvalidDataException("Ability data is empty.");
+        return objects;
+    }
+
+    public static AbilityLibrary LoadAbilities(Stream[] streams)
+    {
+        var library = new AbilityLibrary();
+        var objects = streams.SelectMany(LoadAbilitiesData);
+        if (objects == null)
+            throw new InvalidDataException("Ability data is empty.");
+        var abilities = objects.Select(x => DeserializeAbility(x.Key, x.Value));
+        foreach (var a in abilities)
+            library.Add(a);
+        return library;
+    }
+
+    public static AbilityLibrary LoadAbilities(Stream stream)
+    {
+        var library = new AbilityLibrary();
+        var objects = LoadAbilitiesData(stream);
+        if (objects == null)
+            throw new InvalidDataException("Ability data is empty.");
         
         var abilities = objects.Select(x => DeserializeAbility(x.Key, x.Value));
         foreach (var a in abilities)
             library.Add(a);
         return library;
     }
-    
+
     private static AbilityImpl DeserializeAbility(string name, SerializedAbility serialized)
     {
         var effect = serialized.Effect;