Option to toggle nearest neighbor filtering & anti-aliasing

## Requested feature
Nearest neighbor is only enabled after an image has been zoomed >400% which leads to blurry pixel art for zoom less than 400%. Anti-aliasing is always enabled for transformations, which makes resizing and rotating less useful for pixel art. It would be great to toggle both of these as optional settings.

## Use case
Blurring at large enough zoom can make pixel art appear difficult to look at. Anti-aliasing can ruin color palettes by introducing new unwanted colors and ruins small sprites. Added option will eliminate these worries.

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Start by locating the zoom logic that enables nearest-neighbor filtering and the transformation code that applies anti-aliasing. Define how optional settings should affect zooming, resizing, and rotating, then verify the results with pixel-art images at different zoom levels and transformation types.

Written by the indexing model from the issue text.