Change scaling method from nearest neighbor to bilinear

[cjfh]

With nearest neighbor interpolation, the game looks very pixelated if it's not running at its native resolution. Bilinear interpolation can be used instead to avoid that issue.

[DragonRatTiger]

I've been playing with this interpolation for a little while, but right now switching to Bilinear this can introduce some soft lines & artifacts in places they previously weren't in.

This can be fixed by disabling Repeat, but will also break scripts that rely on repeating textures.

[DragonRatTiger]

The latest commit fixed the soft lines in the previous picture, but introduced a new issue with one of our existing backgrounds

There's a clamping issue with the left and right ends of the Dango background (can be seen in any Chapter I song w/ the Open-World Memories skin)