update TODO, done optimizing newalpha()
- Implement @x2 images for better result
# Optimisation
-- Optimize newalpha() method in abstract class -> could potentially reduce a lot of execution time
- Optimize RAM Memory by reducing the amount of prepared frame
- Avoid redrawing unchanged image to reduce execution time. (Slider body, Spinner background, Button, Score can be redrawn less often)
- Delete uunsed prepared frames
