itemclick: move click handler into seperate module

modules/itemclick.lua

@@ -0,0 +1,31 @@
+pfUI:RegisterModule("itemclick", function ()
+  -- small module that tries to decide if an item should be used or dropped into
+  -- the auctionhouse search or trade window
+
+  local pfHookUseContainerItem = _G.UseContainerItem
+  function _G.UseContainerItem(bag,slot)
+    if TradeFrame:IsShown() then
+      PickupContainerItem(bag,slot)
+      local slot = TradeFrame_GetAvailableSlot()
+      if slot then ClickTradeButton(slot) end
+      if CursorHasItem() then
+        ClearCursor()
+      end
+    elseif AuctionFrame and AuctionFrame:IsShown() and
+        AuctionFrameBrowse and AuctionFrameBrowse:IsShown() then
+      local link = GetContainerItemLink(bag,slot)
+      local name = link and string.sub(link, string.find(link, "%[")+1, string.find(link, "%]")-1) or ""
+      BrowseName:SetText(name)
+      AuctionFrameBrowse_Search()
+    elseif AuctionFrame and AuctionFrame:IsShown() and
+        AuctionFrameAuctions and AuctionFrameAuctions:IsShown() then
+      PickupContainerItem(bag,slot)
+      AuctionsItemButton:Click()
+      if CursorHasItem() then
+        ClearCursor()
+      end
+    else
+      pfHookUseContainerItem(bag,slot)
+    end
+  end
+end)