Add a search icon to highlight item(s) in stash

[daviderickson]

This commit adds a search button that when clicked will highlight the requested trade item(s) in the stash.

Description

As described in the commit message, when you click the search icon it will copy the item's position (if known) or name into the highlight box for the stash.

Replication Steps

Screenshots/Video

How Has This Been Tested?

• [ ] ran npm run ng:lint
• [ ] ran npm run format
• [X] ran npm run ng:test
• [ ] added unit tests
• [X] manually tested