Trader improvements

[vaisest]

Description of the problem being solved:

This solves some annoying steps with the trader tool. Notably it allows for and defaults to filtering out whisper listings, as these are often not actually going to be sold at the listed price. For async trade it also adds a button to show the result page as apparently GGG considers using the direct whisper/travel API to be past the line of breaking TOS.

Steps taken to verify a working solution:

• A decent amount of testing by finding upgrades for my own build, but no automated tests.

Before screenshot:

After screenshot:

I'm still planning on at least adding the async dropdown to the timeless jewel menu. I think it'd also be useful to add a setting for copying existing eldritch implicits as those being different often ruin the search results. Adding simple resistance swapping would also be very useful.