Fix all build warnings

- vk_utils.hpp: mark unused 'msg' parameter with [[maybe_unused]]
- world_packets.cpp: write exactMatch field to auction list packet
  (was accepted as parameter but never serialized)
- game_screen.cpp: remove unused bagIcons array and unused info variable
- talent_screen.cpp: remove unused nextRank and pMin variables

src/game/world_packets.cpp

@@ -4276,6 +4276,7 @@ network::Packet AuctionListItemsPacket::build(
     p.writeUInt32(quality);
     p.writeUInt8(usableOnly);
     p.writeUInt8(0);  // getAll (0 = normal search)
+    p.writeUInt8(exactMatch);
     // Sort columns (0 = none)
     p.writeUInt8(0);
     return p;