Remove unused class

StabilityMatrix.Avalonia/Models/ILoadableState.cs

@@ -1,26 +0,0 @@
-using System;
-using System.Text.Json;
-using System.Text.Json.Nodes;
-
-namespace StabilityMatrix.Avalonia.Models;
-
-public interface ILoadableState<T> : IJsonLoadableState
-{
-    new Type LoadableStateType => typeof(T);
-    
-    void LoadState(T state);
-
-    new void LoadStateFromJsonObject(JsonObject state)
-    {
-        state.Deserialize(LoadableStateType);
-    }
-    
-    T SaveState();
-    
-    new JsonObject SaveStateToJsonObject()
-    {
-        var node = JsonSerializer.SerializeToNode(SaveState());
-        return node?.AsObject() ?? throw new 
-            InvalidOperationException("Failed to serialize state to JSON object.");
-    }
-}