SDL : Comments fixed and added in SDLRectangle class

signed-off-by: Geoffrey Hecht  <geoffrey.hecht@gmail.com>
SDL : Comments  added for SDLMouseEvent, MouseButtonEvent,MouseMotionEvent  class

signed-off-by: Geoffrey Hecht  <geoffrey.hecht@gmail.com>
SDL : Comments  added for SDLkeyEvent  class

signed-off-by: Geoffrey Hecht  <geoffrey.hecht@gmail.com>
SDL : Comments  added for SDLFont  class and methods

signed-off-by: Geoffrey Hecht  <geoffrey.hecht@gmail.com>