Update wt so it doesn't depend on Qt4 which will be removed soon (boo#1179613)

- update to 4.4.0:
  * Wt 4.4.0 adds a couple of new features, like multiple X axes, and
  * WColorPicker, among other fixes and tweaks 
  * security related: Wt now rejects GET requests for Ajax-enabled sessions
  that are not for resources, as an extra means to prevent session
  hijacking attempts 
  * Wt 4.3.0 mainly adds the ability to redirect logging to a custom logging
  function, and login and transport encryption to the mail client, among some
  other fixes and tweaks
  see https://webtoolkit.eu/wt/doc/reference/html/Releasenotes.html

- Update to new upstream release 4.2.2:
  * ensure that tooltips are always on top, even inside of a dialog
  * fixed text format being reset when the text of a WAnchor is cleared
  * fixed panning not working properly for a WCartesianChart with plain tooltips
  * fixed JavaScript memory leak related to deferred or HTML tooltips
  * and lots of other fixes (https://webtoolkit.eu/wt/doc/reference/html/Releasenotes.html)

- Update to 4.2.0
  * WSuggestionPopup: wordSeparators no longer requires (extra) escaping
  * The WLogEntry copy constructor was removed and replaced by a move constructor
  * Removed WDatePicker::setGlobalPopup
  * the default visibility of symbols is now set to hidden
  * It's now possible to get client certificate information in wthttp when behind a reverse proxy
  * WLogEntry can now use argument dependent lookup
  * Limited prevention of default action of the dragstart event to only draggable widgets.
  * Fixed removal of all widgets in a layout causing a JavaScript error
  and many more. Check the Changelog file for details.
- Run spec-cleaner

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