Add copy and move constructors to Bitmap class for better resource management

- Implemented a copy constructor and copy assignment operator to enable deep copying of Bitmap objects.
- Added move constructor and move assignment operator to optimize resource handling and prevent unnecessary data duplication.
- Introduced SetPixel method for modifying individual pixels in the bitmap.
- Added Resize method to adjust bitmap dimensions while preserving existing pixel data, enhancing flexibility in bitmap manipulation.

src/app/gfx/bitmap.h

@@ -71,6 +71,31 @@ class Bitmap {
   Bitmap(int width, int height, int depth, const std::vector<uint8_t> &data,
          const SnesPalette &palette);
 
+  /**
+   * @brief Copy constructor - creates a deep copy
+   */
+  Bitmap(const Bitmap& other);
+
+  /**
+   * @brief Copy assignment operator
+   */
+  Bitmap& operator=(const Bitmap& other);
+
+  /**
+   * @brief Move constructor
+   */
+  Bitmap(Bitmap&& other) noexcept;
+
+  /**
+   * @brief Move assignment operator
+   */
+  Bitmap& operator=(Bitmap&& other) noexcept;
+
+  /**
+   * @brief Destructor
+   */
+  ~Bitmap() = default;
+
   /**
    * @brief Create a bitmap with the given dimensions and data
    */
@@ -134,6 +159,16 @@ class Bitmap {
    */
   void WriteColor(int position, const ImVec4 &color);
 
+  /**
+   * @brief Set a pixel at the given x,y coordinates
+   */
+  void SetPixel(int x, int y, const SnesColor& color);
+
+  /**
+   * @brief Resize the bitmap to new dimensions
+   */
+  void Resize(int new_width, int new_height);
+
   /**
    * @brief Extract an 8x8 tile from the bitmap
    */