flood fill

[robertpfeiffer]

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Flood fill drawing operation, like in GIMP and ASEprite.

This still needs docs and tests, and perhaps some more special-case handling of indexed surfaces. Can take a pattern surface as color argument. If you like this, maybe we can add pattern surfaces to polygons also, but in a pinch, you can draw a polygon and then use flood fill, or draw a polygon on an intermediate surface, use flood fill, and then blit the surface.

One thing this can't do that you can do in GIMP is gradients.