Significantly enhance hardware key robustness

* Significantly improve user experience when using hardware keys on databases in both GUI and CLI modes. Prevent locking up the YubiKey USB interface for prolonged periods of time. Allows for other apps to use the key concurrently with KeePassXC.

* Improve messages displayed to user when finding keys and when user interaction is required. Output specific error messages when handling hardware keys during database read/write.

* Only poll for keys when previously used or upon user request. Prevent continuously polling keys when accessing the UI such as switching tabs and minimize/maximize.

* Add support for using multiple hardware keys simultaneously. Keys are identified by their serial number which prevents using the wrong key during open and save operations.

* Fixes #4400
* Fixes #4065
* Fixes #1050
* Fixes #1215
* Fixes #3087
* Fixes #1088
* Fixes #1869

src/keys/YkChallengeResponseKeyCLI.h

@@ -33,17 +33,18 @@ class YkChallengeResponseKeyCLI : public QObject, public ChallengeResponseKey
 public:
     static QUuid UUID;
 
-    explicit YkChallengeResponseKeyCLI(int slot, bool blocking, QString messageInteraction, QIODevice* out);
+    explicit YkChallengeResponseKeyCLI(YubiKeySlot keySlot, QString interactionMessage, QTextStream& out);
 
     QByteArray rawKey() const override;
     bool challenge(const QByteArray& challenge) override;
-    bool challenge(const QByteArray& challenge, unsigned int retries);
+
+private slots:
+    void showInteractionMessage();
 
 private:
     QByteArray m_key;
-    int m_slot;
-    bool m_blocking;
-    QString m_messageInteraction;
+    YubiKeySlot m_keySlot;
+    QString m_interactionMessage;
     QTextStream m_out;
 };