refactor!: IGameObject removed

Engine.Core/Abstract/Assignable/IHasEntity.cs

@@ -0,0 +1,26 @@
+namespace Syntriax.Engine.Core.Abstract;
+
+/// <summary>
+/// Indicates the object is an <see cref="IAssignable"/> with an assignable <see cref="IEntity"/> field.
+/// </summary>
+public interface IHasEntity : IAssignable
+{
+    /// <summary>
+    /// Event triggered when the <see cref="IEntity"/> value has has been assigned a new value.
+    /// </summary>
+    event OnEntityAssignedEventHandler? OnEntityAssigned;
+
+    /// <inheritdoc cref="IEntity" />
+    IEntity Entity { get; }
+
+    /// <summary>
+    /// Assign a value to the <see cref="IEntity"/> field of this object.
+    /// </summary>
+    /// <param name="entity">New <see cref="IEntity"/> to assign.</param>
+    /// <returns> 
+    /// <see cref="true"/>, if the value given assigned successfully assigned, <see cref="false"/> if not.
+    /// </returns>
+    bool Assign(IEntity entity);
+
+    delegate void OnEntityAssignedEventHandler(IHasEntity sender);
+}