Changed calculation of scale in Renderer

-Scale is now calculated so that it's 1 for 1080p ( default resolution )
-If the height is less than 1080, the scale will be calculated by
dividing height by 1080p and then taking the square root of the result.
Improved scaling

-Further improvement on scaling
-Scale is now height of window divided by 1080 ( default height )
-Moved scaling of BonusBoxes to AddBonusBox()
-Updated size of BonusBox and Bullet