Nullable fixes, use Texture2d resource for rendering directly.

DaggerFramework/Source/Rendering/StandardRenderer.cs

@@ -83,7 +83,7 @@ namespace DaggerFramework.Rendering
         }
 
         /// <inheritdoc />
-        public override void DrawTexture(int id, Color tint)
+        public override void DrawTexture(Texture2d texture, Color tint)
         {
             throw new NotImplementedException();
         }
@@ -94,12 +94,6 @@ namespace DaggerFramework.Rendering
             return 0.0;
         }
 
-        /// <inheritdoc />
-        public override int LoadTexture(Texture2d texture)
-        {
-            throw new NotImplementedException();
-        }
-
         /// <inheritdoc />
         protected override void SetTargetFps(int fps)
         {
@@ -196,7 +190,6 @@ namespace DaggerFramework.Rendering
             throw new NotImplementedException();
         }
 
-
         private GL _gl;
         private Glfw _glfw;
         private unsafe WindowHandle* _windowHandle;