Use Bilinear Scaling for Image Slides

Description

The patch replaces the Nearest Neighbor Scaling algorithm used for images with Bilinear Scaling.

This should give somewhat more pleasing results when using image slides for graphs, or other material which suffers badly under aliasing.

Notes

Due to the nature of Bilinear Scaling, scaling down more than 50% will have somewhat less pleasing results. Scaling up will generally be quite blurry.

There is room for further improvement of image scaling, e.g: Implementing a better scaling algorithm such as bicubic, or lancszos; and/or using separate algorithms for scaling up or down.

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