Feature request: Knight orientation

[SlimeDog]

I would like to modify the models to rotate the knights on the vertical axis -90°, as illustrated below, viewed from the white side of the board. I can make that change in my local copy of the resourcepack (which I have merged into my larger resourcepack), but you might want to make rotation a configurable option instead.

And for chess problems, maybe a more "standard" orientation, where both knights face left.

[SlimeDog]

I gave editing the JSON a try, but it's too complex for me (I tried rotating the cardinal points -- north, east, south, west -- by one step, but that didn't change the presentation). If you're willing, please give me a modified chess_knight_black.json and chess_knight_white.json that perform this magic.