API renames, change ref renderer to in renderer in IDrawable, make Layer implement IDrawable.

Source/Entities/CircleShape2d.cs

@@ -9,7 +9,7 @@ namespace DaggerFramework
         public float Radius { get => _radius; set => _radius = value; }
         public Color Color { get => _color; set => _color = value; }
 
-        public override void OnDraw(ref Renderer renderer)
+        public override void OnDraw(in Renderer renderer)
         {
             renderer.DrawCircle(_radius, _color);
         }

Source/Entities/Drawable2d.cs

@@ -4,12 +4,12 @@ namespace DaggerFramework
 {
     public abstract class Drawable2d : Entity2d, IDrawable
     {
-        public void Draw(ref Renderer renderer)
+        public void Draw(in Renderer renderer)
         {
             renderer.SetTransform(position);
-            OnDraw(ref renderer);
+            OnDraw(in renderer);
         }
 
-        public abstract void OnDraw(ref Renderer renderer);
+        public abstract void OnDraw(in Renderer renderer);
     }
 }

Source/Entities/IDrawable.cs

@@ -4,6 +4,6 @@ namespace DaggerFramework
 {
     public interface IDrawable
     {
-        public void Draw(ref Renderer renderer);
+        public void Draw(in Renderer renderer);
     }
 }

Source/Entities/Particles2d.cs

@@ -21,7 +21,7 @@ namespace DaggerFramework
             CleanupParticles();
             InitializeParticles();
         }
-        public override void OnDraw(ref Renderer renderer)
+        public override void OnDraw(in Renderer renderer)
         {
             foreach (var particle in _particles)
             {

Source/Entities/Sprite2d.cs

@@ -14,7 +14,7 @@ namespace DaggerFramework
             _texId = renderer.LoadTexture(_texture);
         }
 
-        public override void OnDraw(ref Renderer renderer)
+        public override void OnDraw(in Renderer renderer)
         {
             renderer.DrawTexture(_texId, Color.White);
         }

Source/Entities/Text2d.cs

@@ -9,7 +9,7 @@ namespace DaggerFramework
         public int FontSize { get => _fontSize; set => _fontSize = value; }
         public Color FontColor { get => _fontColor; set => _fontColor = value; }
 
-        public override void OnDraw(ref Renderer renderer)
+        public override void OnDraw(in Renderer renderer)
         {
             renderer.DrawDebugText(position, _contents, _fontSize, _fontColor);
         }