More filters for `Character.locateItem()`

[earthiverse]

• returnLowestQuantity
• returnHighestQuantity

And somehow, for Character.locateItems(), a way to return items of a specific slot type.
It's a bit tricky for weapons since we have to figure out a way to return items that match a specific class, too.

[StormSurge95]

Weapons shouldn't be too difficult cuz each one should have wtype within its ItemData. But yeah it might be more complicated than just slot types.

[earthiverse]

returnLowestQuantity and returnHighestQuantity have been added, but I should probably add a test for them, too.

wtype is a good filter, too.

[StormSurge95]

right now, we have the option to filter by special which is a plain boolean value. Perhaps we could change that so that it would still accept plain true but also accept glitched or shiny or whatever other prefix so that we could return a specific kind of special?