feat: Add in-game custom hotkey remapping for unit/building production keys

- Add per-faction (USA/China/GLA) hotkey categories to KeyboardOptionsMenu

- Override-Map in HotKeyManager for persistent key rebinding

- Manual overlay layout management (no Shell push/pop conflicts)

- ComboBox category selector, ListBox command list, TextEntry key input

- Assign/ResetAll buttons with full MetaMap + CommandButton support

Author: wahidkurdo

GeneralsMD/Code/GameEngine/Include/GameClient/GUICallbacks.h

@@ -130,6 +130,8 @@ extern void KeyboardOptionsMenuUpdate( WindowLayout *layout, void *userData );
 extern void KeyboardOptionsMenuShutdown( WindowLayout *layout, void *userData );
 extern WindowMsgHandledType KeyboardOptionsMenuSystem( GameWindow *window, UnsignedInt msg, WindowMsgData mData1, WindowMsgData mData2 );
 extern WindowMsgHandledType KeyboardOptionsMenuInput( GameWindow *window, UnsignedInt msg, WindowMsgData mData1, WindowMsgData mData2 );
+extern void OpenKeyboardOptionsMenu( void );   ///< open as overlay (no Shell push)
+extern void CloseKeyboardOptionsMenu( void );  ///< close overlay and return to Options
 
 // Lan Lobby Menu ----------------------------------------------------------------------------------
 extern void LanLobbyMenuInit( WindowLayout *layout, void *userData );

GeneralsMD/Code/GameEngine/Source/Common/System/FunctionLexicon.cpp

@@ -294,6 +294,7 @@ static FunctionLexicon::TableEntry winLayoutUpdateTable[] =
 
 	{ NAMEKEY_INVALID, "MainMenuUpdate",                  (void*)MainMenuUpdate },
 	{ NAMEKEY_INVALID, "OptionsMenuUpdate",               (void*)OptionsMenuUpdate },
+	{ NAMEKEY_INVALID, "KeyboardOptionsMenuUpdate",       (void*)KeyboardOptionsMenuUpdate },
 	{ NAMEKEY_INVALID, "SinglePlayerMenuUpdate",          (void*)SinglePlayerMenuUpdate },
 	{ NAMEKEY_INVALID, "MapSelectMenuUpdate",             (void*)MapSelectMenuUpdate },
 	{ NAMEKEY_INVALID, "LanLobbyMenuUpdate",              (void*)LanLobbyMenuUpdate },