change highest_rarity_sword -> highest_rarity_weapon

[dukio]

https://github.com/SkyCryptWebsite/SkyCrypt/blob/2e2e979df68f1f45015df8795b0ba19d68141813/src/lib.js#L1446-L1456

currently we calculate highest_rarity_sword and highest_rarity_bow...

1. highest_rarity_bow is not even used
2. highest_rarity_sword is used to display the top weapon... but it only counts for weapons... this doesn't make sense anymore since a bow can be the top tier weapon now, there's wands too and other item types

Proposal:

1. deprecate both highest_rarity_sword and highest_rarity_bow
2. make highest_rarity_weapon (which counts for all weapons displayed in the weapons section)