make it much harder to accidentally offend the elves

[myk002]

• DFHack dialogs for trade screens (both Bring goods to depot and the Trade barter screen) can now filter by item origins (foreign vs. fort-made) and can filter bins by whether they have a mix of ethically acceptable and unacceptable items in them
• If you have managed to select an item that is ethically unacceptable to the merchant, an "Ethics warning" badge will now appear next to the "Trade" button. Clicking on the badge will show you which items that you have selected are problematic. The dialog has a button that you can click to deselect the problematic items in the trade list.
• If you have ethically unacceptable items selected for trade, the "Are you sure you want to trade" confirmation will warn you about them
• Layout overhaul for both trade dialogs

Fixes: DFHack/dfhack#4836

[myk002]

vidcap-2024-08-12_09.12.55.mp4