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/PageSettingsServerProtocols.qml

@@ -20,6 +20,9 @@ PageType {
 
     property var installedProtocolsCount
 
+    onFocusChanged: settingsContainersListView.forceActiveFocus()
+    signal lastItemTabClickedSignal()
+
     FlickableType {
         id: fl
         anchors.top: parent.top
@@ -35,6 +38,7 @@ PageType {
 
             SettingsContainersListView {
                 id: settingsContainersListView
+
                 Connections {
                     target: ServersModel