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/Controls2/VerticalRadioButton.qml

@@ -20,16 +20,23 @@ RadioButton {
     property string textColor: "#D7D8DB"
     property string selectedTextColor: "#FBB26A"
 
+    property string borderFocusedColor: "#D7D8DB"
+    property int borderFocusedWidth: 1
+
     property string imageSource
     property bool showImage
 
     hoverEnabled: true
+    focusPolicy: Qt.TabFocus
 
     indicator: Rectangle {
         id: background
 
         anchors.verticalCenter: parent.verticalCenter
 
+        border.color: root.focus ? root.borderFocusedColor : "transparent"
+        border.width: root.focus ? root.borderFocusedWidth : 0
+
         implicitWidth: 56
         implicitHeight: 56
         radius: 16
@@ -51,6 +58,10 @@ RadioButton {
             PropertyAnimation { duration: 200 }
         }
 
+        Behavior on border.color {
+            PropertyAnimation { duration: 200 }
+        }
+
         Image {
             source: {
                 if (showImage) {