Add Quick Buy — one-click buyout of stacked auction listings

[Leemo94]

What this adds

Buying lots of cheap, stacked auctions is tedious — clicking row → Buyout → confirm over and over. Quick Buy turns it into one click per stack.

On the Buy tab, click a price row that holds several stacks at the same price and it expands into a small panel with a Buy button per stack (Shift-click a row works too). Each click buys one stack, no confirmation pop-up — so a listing of 30× stacks of 1 takes ~30 clicks in the same spot instead of ~90 clicks and dialogs.

Demo

From the player's side

• Click a multi-stack price row → it expands beside the AH into per-stack Buy buttons.
• One click = one buyout, no confirm dialog. Shift-click a row does the same.
• Chain-click the top button to sweep a whole listing — it stays put, so your mouse doesn't move.
• Bought stacks drop out of both the panel and Auctionator's main list.
• Pages through large listings automatically; tells you in chat if an auction gets sniped.

How it works (and why it's safe to merge)

• One new self-contained file (AuctionatorQuickBuy.lua) + one line in the .toc. No existing files or behaviour changed.
• Hooks Atr_EntryOnClick and reads the pane via Atr_GetCurrentPane() / activeScan.sortedData, so it reuses the existing scan + UI instead of duplicating anything.
• Every buyout is placed from a hardware event (a button click) against the live auction list at that instant (GetAuctionItemInfo("list", …) → PlaceAuctionBid), then calls the existing AuctionatorSubtractFromScan to keep the list in sync.
• Ascension completes one buyout per server round-trip, so it throttles the button until the game confirms "You won an auction…" before firing the next — mashing never loses a click or bids a phantom.
• Guards on every external call, so it degrades gracefully if dropped onto a different Auctionator.

Footprint

 Auctionator/Auctionator.toc         |   1 +
 Auctionator/AuctionatorQuickBuy.lua | 369 +

Testing

Search an item with several same-price stacks (e.g. Linen Cloth) on the Buy tab → click that row → the Quick Buy panel appears beside the AH → click Buy down the list. /qbdebug toggles verbose logging.