add note about card auctions

README.md

@@ -31,6 +31,7 @@ With that said, I offer no guarantees on how or when this project will advance.
 Current known issues / missing features / things to do:
 - Support disconnect hooks to clean up state, like if a client disconnects during quest loading or during a trade window execution.
 - Episode 3 battles and tournaments aren't implemented. (Some reverse-engineering has already been done here though - see Episode3.hh/cc)
+    - Card auctions could be supported without too much effort, though; only the EF command needs to be implemented.
 - PSOBB is not well-tested and likely will disconnect or misbehave when clients try to use unimplemented features.
     - Enemy indexes also desync slightly in most games, often in later areas, leading to incorrect EXP values being given for killed enemies.
 - Fix some edge cases on the BB proxy server (e.g. make sure Change Ship does the right thing, which is not the same as what it should do on V2/V3).

src/ReceiveCommands.cc

@@ -3337,7 +3337,7 @@ static on_command_t handlers[0x100][6] = {
   /* EC */ {nullptr,                 nullptr,                    nullptr,                         on_create_game_dc_v3,        nullptr,                     on_leave_char_select_bb,        }, /* EC */
   /* ED */ {nullptr,                 nullptr,                    nullptr,                         nullptr,                     nullptr,                     on_change_account_data_bb,      }, /* ED */
   /* EE */ {nullptr,                 nullptr,                    nullptr,                         on_card_trade,               nullptr,                     nullptr,                        }, /* EE */
-  /* EF */ {nullptr,                 nullptr,                    nullptr,                         nullptr,                     nullptr,                     nullptr,                        }, /* EF */
+  /* EF */ {nullptr,                 nullptr,                    nullptr,                         on_ignored_command,          nullptr,                     nullptr,                        }, /* EF */
   /* F0 */ {nullptr,                 nullptr,                    nullptr,                         nullptr,                     nullptr,                     nullptr,                        }, /* F0 */
   /* F1 */ {nullptr,                 nullptr,                    nullptr,                         nullptr,                     nullptr,                     nullptr,                        }, /* F1 */
   /* F2 */ {nullptr,                 nullptr,                    nullptr,                         nullptr,                     nullptr,                     nullptr,                        }, /* F2 */