Added tab navigation functional. (#721)

- Added tab navigation functional.
- In basic types added parentFlickable property, which will help to ensure, that the item is visible within flickable parent during tab navigation.
- Added focus state for some basic types.
- In PageType qml file added lastItemTabClicked function, which will help to focus tab bar buttons when the last tab on the current page clicked.
- Added Focus for back button for all pages and drawers.
- Added scroll on tab for Servers ListView on PageHome.

client/ui/qml/Pages2/PageSettingsBackup.qml

@@ -16,6 +16,8 @@ import "../Controls2/TextTypes"
 PageType {
     id: root
 
+    defaultActiveFocusItem: focusItem
+
     Connections {
         target: SettingsController
 
@@ -34,6 +36,11 @@ PageType {
         }
     }
 
+    Item {
+        id: focusItem
+        KeyNavigation.tab: backButton
+    }
+
     BackButtonType {
         id: backButton
 
@@ -41,6 +48,8 @@ PageType {
         anchors.left: parent.left
         anchors.right: parent.right
         anchors.topMargin: 20
+
+        KeyNavigation.tab: makeBackupButton
     }
 
     FlickableType {
@@ -102,9 +111,12 @@ PageType {
                         PageController.showNotificationMessage(qsTr("Backup file saved"))
                     }
                 }
+
+                KeyNavigation.tab: restoreBackupButton
             }
 
             BasicButtonType {
+                id: restoreBackupButton
                 Layout.fillWidth: true
                 Layout.topMargin: -8
 
@@ -124,6 +136,8 @@ PageType {
                         restoreBackup(filePath)
                     }
                 }
+
+                Keys.onTabPressed: lastItemTabClicked()
             }
         }
     }