fix All things drawn into the screen misplaced by one pixel too high(does not affect physics)

[Roukira]

Only the main screen image is not affected by this (because it starts at 0).
This will be done by finally implementing the Renderer static class which will have a lot of functions to allow for easier rendering :

• drawImage(Graphics 2D g, BufferedImage image, int posX, int posY)
• drawString(...)
• drawPixel(...)
• drawLine(...)
• many other draw methods