Diversify magic weapon icons: Crossbows

[M0nk3yy]

The base item, +1 variant, and Vicious variant is unique for each kind of crossbow. The +2, and +3 variants are the same no matter the type of bow. This gives good diversity whilst compromising with the limited icon set. It also ensures that if a character was able to upgrade through every variant of their chosen weapon type, they would always see a new icon with an appropriate aesthetic for the rarity.

Hand Crossbows:

Light Crossbows:

Heavy Crossbows:

PR to follow.