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/HorizontalRadioButton.qml

@@ -19,6 +19,7 @@ RadioButton {
     property string checkedBorderColor: "#FBB26A"
     property string defaultBodredColor: "transparent"
     property string checkedDisabledBorderColor: "#84603D"
+    property string borderFocusedColor: "#D7D8DB"
     property int borderWidth: 0
 
     implicitWidth: content.implicitWidth
@@ -47,6 +48,8 @@ RadioButton {
                     return root.pressedBorderColor
                 } else if (root.checked) {
                     return root.checkedBorderColor
+                } else if (root.activeFocus) {
+                    return root.borderFocusedColor
                 }
                 return root.defaultBodredColor
             } else {
@@ -58,7 +61,7 @@ RadioButton {
         }
 
         border.width: {
-            if(root.checked) {
+            if(root.checked || root.activeFocus) {
                 return 1
             }
             return root.pressed ? 1 : 0
@@ -97,4 +100,12 @@ RadioButton {
         cursorShape: Qt.PointingHandCursor
         enabled: false
     }
+
+    Keys.onEnterPressed: {
+        this.clicked()
+    }
+
+    Keys.onReturnPressed: {
+        this.clicked()
+    }
 }