Switch to MariaDB connector and Create UserManager Class

Gui/firststart.qml

@@ -1,6 +1,7 @@
 import QtQuick
 import QtQuick.Layouts
 import QtQuick.Controls
+import QtQuick.Dialogs
 
 import "../js/qmldict.js" as Qmldict
 
@@ -22,6 +23,66 @@ import "../js/qmldict.js" as Qmldict
 
 Item
 {
+    Component.onCompleted:
+    {
+        config.dbConnectionError.connect(onDbConnectionError)
+        config.adminUserError.connect(onAdminUserError)
+    }
+
+    function onDbConnectionError(msg, success)
+    {
+        if (!success)
+            conErrDialog.open()
+    }
+
+    function onAdminUserError(msg, success)
+    {
+        if (success)
+        {
+            encryptPwDialog.open()
+        }
+        else
+            firstStart.push("AdminUserConfig.qml")
+    }
+
+
+    MessageDialog
+    {
+        id: conErrDialog
+        text: qsTr("Datenbankverbindung fehlgeschlagen")
+
+        title: qsTr("Datenbank Verbindung")
+
+
+    }
+    Dialog
+    {
+        id: encryptPwDialog
+        modal: true
+        title: qsTr("Encryption Key")
+        anchors.centerIn: parent
+        standardButtons: Dialog.Ok | Dialog.Cancel
+        onAccepted: config.setEncyrptKey(encryptPassword.text)
+        ColumnLayout
+        {
+            RowLayout
+            {
+                Label
+                {
+                    text: qsTr("Encryption Key eingeben:")
+                }
+
+                TextField
+                {
+                    id: encryptPassword
+                    echoMode: TextInput.Password
+                    implicitWidth: 300
+                    placeholderText: qsTr("Hier Encryption Key eingeben")
+                }
+            }
+        }
+    }
+
     anchors.fill: parent
     StackView
     {
@@ -66,14 +127,7 @@ Item
                     if (pyqcrm_conf)
                     {
                         admin = config.setConfig(pyqcrm_conf)
-                        if (admin)
-                        {
-                            firstStart.push("EncryptionKey.qml")
-                        }
-                        else
-                        {
-                            firstStart.push("AdminUserConfig.qml")
-                        }
+
                     }
                 }
                 else