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

Examples/Textures/ImageRotate.cs

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+/*******************************************************************************************
+*
+*   raylib [textures] example - image rotate
+*
+*   Example complexity rating: [★★☆☆] 2/4
+*
+*   Example originally created with raylib 1.0, last time updated with raylib 1.0
+*
+*   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) 2014-2025 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using static Raylib_cs.Raylib;
+
+namespace Examples.Textures;
+
+public partial class ImageRotate : IExample
+{
+    private const int screenWidth = 800;
+    private const int screenHeight = 450;
+
+    private const int NumTextures = 3;
+
+    public string Name => "Textures / Image Rotate";
+
+    public string Title => "raylib [textures] example - image rotate";
+
+    private Texture2D[] textures;
+    private int currentTexture;
+
+    public void Init()
+    {
+        // NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
+        var image45 = LoadImage("resources/raylib_logo.png");
+        var image90 = LoadImage("resources/raylib_logo.png");
+        var imageNeg90 = LoadImage("resources/raylib_logo.png");
+
+        ImageRotate(ref image45, 45);
+        ImageRotate(ref image90, 90);
+        ImageRotate(ref imageNeg90, -90);
+
+        textures = new Texture2D[NumTextures];
+
+        textures[0] = LoadTextureFromImage(image45);
+        textures[1] = LoadTextureFromImage(image90);
+        textures[2] = LoadTextureFromImage(imageNeg90);
+
+        UnloadImage(image45);
+        UnloadImage(image90);
+        UnloadImage(imageNeg90);
+
+        currentTexture = 0;
+    }
+
+    public void Update()
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        if (IsMouseButtonPressed(MouseButton.Left) || IsKeyPressed(KeyboardKey.Right))
+        {
+            currentTexture = (currentTexture + 1) % NumTextures; // Cycle between the textures
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+        ClearBackground(Color.RayWhite);
+
+        DrawTexture(
+            textures[currentTexture],
+            screenWidth / 2 - textures[currentTexture].Width / 2,
+            screenHeight / 2 - textures[currentTexture].Height / 2,
+            Color.White);
+
+        DrawText("Press LEFT MOUSE BUTTON to rotate the image clockwise", 250, 420, 10, Color.DarkGray);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    public void Unload()
+    {
+        for (var i = 0; i < NumTextures; i++)
+        {
+            UnloadTexture(textures[i]);
+        }
+    }
+
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        InitWindow(screenWidth, screenHeight, "raylib [textures] example - image rotate");
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        var game = new ImageRotate();
+        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;
+    }
+}