Move all keyring management functions to a separate class.

KeyringIO imports, creates and deletes keys. Everything is declared
private in this class, and it can be called by K7Main only.

KeyringIO.h

@@ -0,0 +1,96 @@
+/* 
+ * File:   KeyringIO.h
+ * Author: SET - nmset@yandex.com
+ * License : GPL v2
+ * Copyright SET - © 2019
+ *
+ * Created on November 13, 2020, 6:46 PM
+ */
+
+#ifndef KEYRINGIO_H
+#define KEYRINGIO_H
+
+#include "K7Main.h"
+#include <Wt/WComboBox.h>
+#include "PopupUploader.h"
+#include "PopupDeleter.h"
+#include "PopupCreate.h"
+
+using namespace Wt;
+
+class K7Main;
+
+/**
+ * Manages the keyring : import, create and delete keys.
+ * Is a pseudo-extension of K7Main. Both classes are friends to each other, and
+ * everything is private here.
+ * Does not edit keys.
+ * @param owner
+ */
+class KeyringIO : public WObject
+{
+    friend class K7Main;
+public:
+
+private:
+    KeyringIO(K7Main * owner);
+    virtual ~KeyringIO();
+    
+    K7Main * m_owner;
+    PopupUpload * m_popupUpload;
+    PopupDelete * m_popupDelete;
+    PopupCreate * m_popupCreate;
+    
+    // Variables from m_owner mapped here.
+    AppConfig * m_config;
+    TransientMessageWidget * m_tmwMessage;
+    WPushButton * m_btnUpload;
+    WPushButton * m_btnImport;
+    WPushButton * m_btnDelete;
+    WPushButton * m_btnCreate ;
+    WLineEdit * m_leSearch;
+
+    
+    /**
+     * Shows a non-blocking popup to upload a key,
+     * with forward confirmation for upload.
+     */
+    void ShowPopupUpload();
+    /**
+     * Actually import the uploaded file.
+     */
+    void DoImportKey();
+    /**
+     * Shows a non-blocking popup to delete a key
+     */
+    void ShowPopupDelete();
+    /**
+     * All public keys can be deleted.
+     * Private keys can be deleted only if the user
+     * manages that key, as declared in the configuration file.
+     * @param fullKeyID
+     * @return 
+     */
+    bool CanKeyBeDeleted(const WString& fullKeyID);
+    /**
+     * Actually delete the key, with forward confirmation in the popup.
+     */
+    void DoDeleteKey();
+    /**
+     * Shows a non-blocking popup to create keys.
+     */
+    void ShowPopupCreate();
+    /**
+     * Validates input and creates the keys.
+     */
+    void DoCreateKey();
+    /**
+     * Shows a button to import an uploaded key
+     * @param spool
+     */
+    void OnUploadCompleted(const WString& spool);
+
+};
+
+#endif /* KEYRINGIO_H */
+