Implement debugitemamount
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Implements debugitemamount, which already exists in the game but wasn't hooked up to any code.
The way this works is that the normal item amount is overridden using cv_kartdebugamount's value as soon as the player "selects" their item, as well as displaying the debug amount in the item roulette drawer.
cv_kartdebugitem.value == item as a condition exists just so the debug amount doesn't bleed into a normal already-set roulette (as shown in the first few seconds of the video), although it will still apply if the item to be debugged already exists in the roulette - not something that super concerns me, but I can tweak it if it's a problem.
Note: 100% sure this is a breaking change and there's no next branch like in Kart v1's repository. If such a branch ends up existing in this repository, let me know and I'll change it.