feat: backporting existing raylib-cs examples and new official raylib examples to WASM, adopting raylib's original code style

Examples/Models/RotatingCube.cs

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+/*******************************************************************************************
+*
+*   raylib [models] example - rotating cube
+*
+*   Example complexity rating: [★☆☆☆] 1/4
+*
+*   Example originally created with raylib 6.0, last time updated with raylib 6.0
+*
+*   Example contributed by Jopestpe (@jopestpe)
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2025 Jopestpe (@jopestpe)
+*
+********************************************************************************************/
+
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Models;
+
+public partial class RotatingCube : IExample
+{
+    private const int screenWidth = 800;
+    private const int screenHeight = 450;
+
+    public string Name => "Models / Rotating Cube";
+
+    public string Title => "raylib [models] example - rotating cube";
+
+    private Camera3D camera;
+    private Model model;
+    private Texture2D texture;
+    private float rotation;
+
+    public unsafe void Init()
+    {
+        // Define the camera to look into our 3d world
+        camera = new();
+        camera.Position = new Vector3(0.0f, 3.0f, 3.0f);
+        camera.Target = new Vector3(0.0f, 0.0f, 0.0f);
+        camera.Up = new Vector3(0.0f, 1.0f, 0.0f);
+        camera.FovY = 45.0f;
+        camera.Projection = CameraProjection.Perspective;
+
+        // Load image to create texture for the cube
+        model = LoadModelFromMesh(GenMeshCube(1.0f, 1.0f, 1.0f));
+        var img = LoadImage("resources/cubicmap_atlas.png");
+        var crop = ImageFromImage(img, new Rectangle(0, img.Height / 2.0f, img.Width / 2.0f, img.Height / 2.0f));
+        texture = LoadTextureFromImage(crop);
+        UnloadImage(img);
+        UnloadImage(crop);
+
+        model.Materials[0].Maps[(int)MaterialMapIndex.Diffuse].Texture = texture;
+
+        rotation = 0.0f;
+    }
+
+    public void Update()
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        rotation += 1.0f;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+        ClearBackground(Color.RayWhite);
+
+        BeginMode3D(camera);
+
+        // Draw model defining: position, size, rotation-axis, rotation (degrees), size, and tint-color
+        DrawModelEx(model, new Vector3(0.0f, 0.0f, 0.0f), new Vector3(0.5f, 1.0f, 0.0f),
+            rotation, new Vector3(1.0f, 1.0f, 1.0f), Color.White);
+
+        DrawGrid(10, 1.0f);
+
+        EndMode3D();
+
+        DrawFPS(10, 10);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    public void Unload()
+    {
+        UnloadTexture(texture); // Unload texture
+        UnloadModel(model);     // Unload model
+    }
+
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        InitWindow(screenWidth, screenHeight, "raylib [models] example - rotating cube");
+
+        SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+        //--------------------------------------------------------------------------------------
+
+        var game = new RotatingCube();
+        game.Init();
+
+        // Main game loop
+        while (!WindowShouldClose())    // Detect window close button or ESC key
+        {
+            game.Update();
+        }
+
+        game.Unload();
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        CloseWindow();          // Close window and OpenGL context
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}