qt4 -> qt5

Here is again new try qt4->qt5
* on previous Pull Request try you asked comment, why I changed the alias of ActiveFocus
- property alias activeFocus2: searchTextInput.activeFocus
--> I actually removed it here, it was not really needed but on TextField, it's now final property, gave error:
----> qrc:/qml/SearchBox.qml:48:5: Cannot override FINAL property

* Thanks for helping me out with git, I am quite new with git, I have used svn long time.

* one point, if you ever see me pushing non-working code, stop the reviewing there, and say it must be fixed, because it's most likely my stupid merging/push failure.