Trade search weapon type selection

[mcmanustfj]

Fixes #6832.

Description of the problem being solved: Can't change weapon class in trade search.

Especially useful if I have two 1h weapons and want to swap the second one to a shield (or vice versa)

Steps taken to verify a working solution:

• Create build
• Add weapon to weapon 2
• Trade for these items
• Find best
• See new "Item Type" dropdown

After screenshot:

Notes:

• Currently not doing all base classes, just the important ones
• Only have possible offhand weapons/shields/quivers for weapon 2, but don't do any validation (i.e. will not stop you from getting a shield and a bow.

[mcmanustfj]

if any other features start modifying the item class for trade lookup, I would suggest creating a lookup table with all the item types and query strings