added client management panel

- added classes for displaying the client management panel
- added class for displaying the client info
- added page to display a list of clients
- added page to display OpenVpn client information
- added diagram with OpenVpn certificate revocation process

client/ui/pages_logic/ClientManagementLogic.cpp

@@ -0,0 +1,44 @@
+#include "ClientManagementLogic.h"
+
+#include "core/servercontroller.h"
+#include "ui/pages_logic/ClientInfoLogic.h"
+#include "ui/models/clientManagementModel.h"
+#include "ui/uilogic.h"
+
+ClientManagementLogic::ClientManagementLogic(UiLogic *logic, QObject *parent):
+    PageLogicBase(logic, parent)
+{
+
+}
+
+void ClientManagementLogic::onUpdatePage()
+{
+    DockerContainer selectedContainer = m_settings->defaultContainer(uiLogic()->selectedServerIndex);
+    QString selectedContainerName = ContainerProps::containerHumanNames().value(selectedContainer);
+    set_labelCurrentVpnProtocolText(tr("Service: ") + selectedContainerName);
+
+    QJsonObject clients;
+
+    auto protocols = ContainerProps::protocolsForContainer(selectedContainer);
+    if (!protocols.empty()) {
+        m_currentMainProtocol = protocols.front();
+
+        ErrorCode e = m_serverController->getClientsList(m_settings->serverCredentials(uiLogic()->selectedServerIndex),
+                                                          selectedContainer, m_currentMainProtocol, clients);
+    }
+    QVector<ClientManagementModel::ClientInfo> clientsArray;
+    for (auto &clientId : clients.keys()) {
+        ClientManagementModel::ClientInfo clientInfo;
+        clientInfo.certId = clientId;
+        clientInfo.name = clients[clientId].toObject()["name"].toString();
+        clientInfo.certData = clients[clientId].toObject()["certificate"].toString();
+        clientsArray.push_back(clientInfo);
+    }
+    qobject_cast<ClientManagementModel*>(uiLogic()->clientManagementModel())->setContent(clientsArray);
+}
+
+void ClientManagementLogic::onClientItemClicked(int index)
+{
+    uiLogic()->pageLogic<ClientInfoLogic>()->setCurrentClientId(index);
+    emit uiLogic()->goToClientInfoPage(m_currentMainProtocol);
+}