Removed the Surface class in favor of small struct specially made for the

block surfaces. (A block surface is a 64x64 tile of a parallax layer.)

I've also done a few things to try and optimize the drawing:

* The back buffer is no longer cleared between frames. This may cause
  regressions, but I do believe that the entire picture area is always
  completely re-rendered for each frame.

  As a result of this, the menu code is now responsible for clearing the
  icon areas itself.

* A few unnecessary copy_rect() calls were commented out in favor of one
  big copy_rect() in ServiceWindows().

* Completely opaque block surfaces are copied with memcpy(), one line at a
  time.

Unless we manage to add intelligent screen redrawing, I don't think it will
get that much faster than this, though there is some unnecessary data
copying in DrawSprite() that could be removed.

And the game is still a terrible CPU hog. I believe the animation runs at
approximately 12 fps. If there's still time left, it will pump out further
frames to get smooth scrolling. We ought to put a cap on that, and if it
has already reached the scroll target it should sleep for the rest of the
render cycle.

svn-id: r9886

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