feat: autoresize (extend/shrink) canvas element

src/graphics/core/ImageData.hpp

@@ -36,6 +36,7 @@ public:
     void mulColor(const ImageData& other);
     void addColor(const glm::ivec4& color, int multiplier);
     void addColor(const ImageData& other, int multiplier);
+    void extend(int newWidth, int newHeight);
 
     std::unique_ptr<ImageData> cropped(int x, int y, int width, int height) const;