Add SetScaleStyle for zoomed images #173
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My use-case is to create an educational video where I want to explain an algorithm that works on images.
I would like to start the video by zooming into an image until we can see the pixels. However, in gg I get a blurry image when zooming in.
By default gg uses the draw package's BiLinear interpolation. This PR adds SetScaleStyle which I use to adjust the interpolation dynamically. While the image in my video is zoomed out, it is linearly interpolated. But once the zoom level is > 1, I switch to NearestNeighbor to show the pixels.
I have tried to keep this in line with the rest of the code, adding SetScaleStyle with a parameter and concrete SetScaleBiLinear etc. for easier auto-completion (if that is your reasoning, makes sense to me at least).