Update default interpolation mode.

[siblount]

Closes #1716
Closes #1701

For images that are upscaled, the interpolation mode should be at a higher quality. Since we now use GPU, we can set the max to High Quality Bicubic as the default.
This pull request changes When zoom > 100% to High quality bicubic.

For images that are downscaled, there is less need for high-quality interpolation since the details are being lost due to the downscale, I set it to Nearest Neighbor but Linear will also be an appropriate option.

[d2phap]

Thanks for the PR! I already fixed it by always using NearestNeighbor for 100% scale.

• When zoom > 100%, the default interpolation should be NearestNeighbor, it's easier for picking color. It's also similar to photo editor apps.
• Using MultiSampleLinear for zoom < 100% is the most optimal:

D2D1_INTERPOLATION_MODE_MULTI_SAMPLE_LINEAR
Uses 4 linear samples within a single pixel for good edge anti-aliasing. This mode is good for scaling down by small amounts on images with few pixels.

[vaisest]

Are you sure linear for downscaling is actually better? Linear seems to produce much more aliased results. Imagemagick has a large amount of documentation on this and their default filter is Lanczos3, which is much less sharp.

[d2phap]

D2D1_INTERPOLATION_MODE does not contain Lanczos3. Considering between quality and performance, D2D1_INTERPOLATION_MODE_MULTI_SAMPLE_LINEAR is the best fit:
https://learn.microsoft.com/en-us/windows/win32/api/d2d1_1/ne-d2d1_1-d2d1_interpolation_mode#constants

This is the default setting, user can always change it.

[siblount]

@d2phap sweet!