Add Easy Joker Resizing

[DigitalDetective47]

Adds the ability to set the size of jokers through parameters
pixel_size controls how large the joker's sprite is considered. Ex: half joker would set pixel_size.h to indicate that it has a smaller sprite. defaults to { w = 71, h = 90 }
display_size controls how the joker's sprite is scaled. Ex: wee joker would set both display_size.h and display_size.w to indicate that it should be shrunk. defaults to pixel_size
partial tables can also be used, with the default being used for missing values
pixel_size and display_size can be combined and both work as normal
in other words, display_size controls the bounding box of the joker, and pixel_size controls the portion of the sprite that it fit to the bounding box
WARNING! stake stickers look broken on narrow & tall jokers. this is a result of how stickers are scaled and cannot reasonably be avoided
also works for consumables, vouchers, and booster packs!