[14/14] gdiplus: Reimplement GdipDrawPath.

[Vincent Povirk]

> Well, GdipWidenPath is actually good enough for the things I've tested
> so far, so it's basically working. What are the possible problems with
> it you are aware of?

It doesn't implement dashed lines and most line cap styles. I think it
also mishandles pen->width == 0.

It doesn't have to be perfect, but it should at least have the
features we implement now.