New features with ``pygame.Surface.scroll`` method

[bilhox]

Hello,

Last year, I experienced OpenGL and repeated textures, and I thought it would be interesting to have a similar feature in pygame. The way we do it right now with current means isn't that good (not optimized). So after discussions, the best would be to add a boolean kwarg to pygame.Surface.scroll named repeat. When it's set to True, it shifts surface pixels by an offset and all out of range pixels come back in the other side. As you can see below at the left (In a future, it would be interesting to implement the mirror repeated case):

Finally, we shall be able to use pygame.Vector2 or tuple / list as arguments, rather than only 2 arguments dx and dy for offset.

This is an example summarizing everything I said:

foo = pygame.image.load("foo.png")
offset = pygame.Vector2(10, 20)
foo.scroll(offset, repeat=True) # repeated
foo.scroll(offset) # not repeated