Refactor folder structure

src/Runtime/Ghost.Engine/Components/Hierarchy.cs

@@ -0,0 +1,24 @@
+using Ghost.Engine.Editor;
+using Ghost.Entities;
+using System.Runtime.CompilerServices;
+
+namespace Ghost.Engine.Components;
+
+[HideEditor]
+public struct Hierarchy : IComponent
+{
+    public Entity parent;
+    public Entity firstChild;
+    public Entity nextSibling;
+
+    public static Hierarchy Root
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => new()
+        {
+            parent = Entity.Invalid,
+            firstChild = Entity.Invalid,
+            nextSibling = Entity.Invalid
+        };
+    }
+}

src/Runtime/Ghost.Engine/Components/LocalToWorld.cs

@@ -0,0 +1,9 @@
+using Ghost.Entities;
+using Misaki.HighPerformance.Mathematics;
+
+namespace Ghost.Engine.Components;
+
+public struct LocalToWorld : IComponent
+{
+    public float4x4 matrix;
+}

src/Runtime/Ghost.Engine/Components/SceneID.cs

@@ -0,0 +1,9 @@
+using Ghost.Engine.Core;
+using Ghost.Entities;
+
+namespace Ghost.Engine.Components;
+
+public struct SceneID : IComponent // TODO: ISharedComponent
+{
+    public Scene scene;
+}