Add support for filtering on number of sockets and links in Item Trader

[Peechey]

Fixes #6538

Description of the problem being solved:

Allow filtering trade queries on number of sockets and/or links. This sets both min and max so it's an exact number match. I added some checks to not show the controls for Flasks or Jewelry when applicable. There is the possibility to search for something with more links than sockets, which would return no results of course but I feel that's on the user not to break. Maybe some check could be added but I wasn't sure if it was worth it.

Pretty sure we could fairly easily update this to let users set min and max instead of hardcoding both if that's something we wanna do.

I also did some refactoring on how we are updating anchors and popup height.

Steps taken to verify a working solution:

• Validate trade query filters generated matches the set socket and/or link number.
• Validate socket only filtering and link only filtering works
• Test socket and link input do not show for Flasks
• Test link input does not show for Rings, Belts, or Amulets

After screenshot:

Body Armour:

Ring:

Flask: