Add GFX_PEEK and GFX_FILL#326
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This will be needed when implementing pixel peeking features as a way to map rendered pixels to their original ANSI colors.
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Implement a graphics peek primitive through the console and raster abstractions so that each backend can map native pixels back to a COLOR value when possible. Expose the new functionality as GFX_PEEK and return -1 for pixels that are out of bounds or cannot be mapped exactly.
Implement a shared 4-way flood-fill algorithm in the graphics console and expose it through a GFX_FILL command.
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