Add sharing of groups between databases

* Add source folder keeshare for sharing with corresponding define WITH_XC_KEESHARE
* Move common crypto parts to src/crypto/ssh
* Extended OpenSSHKey
* Move filewatching to own file (currently in two related classes DelayedFileWatcher and BulkFileWatcher)
* Small improvements for style and code in several classes
* Sharing is secured using RSA-Keys which are generated on demand
* Publisher signs the container using their private key
* Client can verify the signed container and choose to decline an import,
import only once or trust the publisher and automatically import all
data of this source henceforth
* Integration of settings into Group-Settings, Database-Settings and Application-Settings
* Introduced dependency QuaZip as dependency to allow combined export of
key container and the (custom format) certificate

src/sshagent/SSHAgent.h

@@ -16,14 +16,14 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef AGENTCLIENT_H
-#define AGENTCLIENT_H
+#ifndef KEEPASSXC_SSHAGENT_H
+#define KEEPASSXC_SSHAGENT_H
 
-#include "OpenSSHKey.h"
 #include <QList>
 #include <QtCore>
 
 #include "gui/DatabaseWidget.h"
+#include "crypto/ssh/OpenSSHKey.h"
 
 class SSHAgent : public QObject
 {
@@ -75,4 +75,4 @@ private:
     QString m_error;
 };
 
-#endif // AGENTCLIENT_H
+#endif // KEEPASSXC_SSHAGENT_H