feat: add symmetric piece set

[tom-anders]

Generated from lichobile code by (temporarily) slightly adapting scripts/convert_svgs_to_pngs.sh

[veloce]

Looks like there are missing assets for 2.0X and 3.0X resolutions.

[tom-anders]

Looks like there are missing assets for 2.0X and 3.0X resolutions.

Are you sure?

❯ git ls-files assets/piece_sets/symmetric
assets/piece_sets/symmetric/2.0x/bB.png
assets/piece_sets/symmetric/2.0x/bK.png
assets/piece_sets/symmetric/2.0x/bN.png
assets/piece_sets/symmetric/2.0x/bQ.png
assets/piece_sets/symmetric/2.0x/wB.png
assets/piece_sets/symmetric/2.0x/wK.png
assets/piece_sets/symmetric/2.0x/wN.png
assets/piece_sets/symmetric/2.0x/wP.png
assets/piece_sets/symmetric/2.0x/wQ.png
assets/piece_sets/symmetric/2.0x/wR.png
assets/piece_sets/symmetric/3.0x/bB.png
assets/piece_sets/symmetric/3.0x/bK.png
assets/piece_sets/symmetric/3.0x/bN.png
assets/piece_sets/symmetric/3.0x/bQ.png
assets/piece_sets/symmetric/3.0x/bR.png
assets/piece_sets/symmetric/3.0x/wB.png
assets/piece_sets/symmetric/3.0x/wK.png
assets/piece_sets/symmetric/3.0x/wN.png
assets/piece_sets/symmetric/3.0x/wP.png
assets/piece_sets/symmetric/3.0x/wR.png
assets/piece_sets/symmetric/4.0x/bB.png
assets/piece_sets/symmetric/4.0x/bK.png
assets/piece_sets/symmetric/4.0x/bN.png
assets/piece_sets/symmetric/4.0x/bP.png
assets/piece_sets/symmetric/4.0x/bQ.png
assets/piece_sets/symmetric/4.0x/bR.png
assets/piece_sets/symmetric/4.0x/wB.png
assets/piece_sets/symmetric/4.0x/wK.png
assets/piece_sets/symmetric/4.0x/wN.png
assets/piece_sets/symmetric/4.0x/wP.png
assets/piece_sets/symmetric/4.0x/wQ.png
assets/piece_sets/symmetric/4.0x/wR.png
assets/piece_sets/symmetric/bB.png
assets/piece_sets/symmetric/bK.png
assets/piece_sets/symmetric/bN.png
assets/piece_sets/symmetric/bP.png
assets/piece_sets/symmetric/bQ.png
assets/piece_sets/symmetric/bR.png
assets/piece_sets/symmetric/wB.png
assets/piece_sets/symmetric/wK.png
assets/piece_sets/symmetric/wN.png
assets/piece_sets/symmetric/wP.png
assets/piece_sets/symmetric/wQ.png
assets/piece_sets/symmetric/wR.png

[tom-anders]

Oh now I see it, sorry, assets/piece_sets/symmetric/2.0x/bP.png is missing for example, I'll have a look

[tom-anders]

Ok, apparently the problem was that scripts/convert_svgs_to_pngs.sh would run multiple inkscape instances in parallel, which for some reason lead to a few files being missed. Removing the & fixed this.

git ls-files assets/piece_sets/symmetric | wc -l now yields 48 (2 * 6 * 4), so all the images should be there now