Log Message:
texworks: update to 0.6.2 and switch to qt5

Release 0.6.2 (TL'17) [April 2017]
* Implement handling of links to external files in the PDF preview
* Implement a simple screen calibration widget to allow adapting the PDF
  preview to the screen's resolution
* Improve responsiveness when opening large documents
* Use old content instead of rendering placeholers after a PDF was reloaded
  to facilitate seeing changes
* Improve the usability of the "Remove Aux Files..." dialog by letting the
  user toogle the selection by clicking anywhere on the row
* Add support for the bibliography program "biber" by default
* Allow custom zoom levels in the PDF status bar context menu
* Add a Windows manifest so TeXworks looks more "native" on modern versions
  of Windows

* Fix PDF zoom speed for high-resolution mouse-wheels
* Fix a deadlock causing TeXworks to hang when loading PDF annotations such
  as links
* Fix crash when changing files outside TeXworks
* Fix crash when syncing from an if-block in the TeX file
* Fix crash when reloading a PDF while text was selected
* Fix enabling of the first/previous/next/last page toolbar buttons in the
  PDF preview
* Fix the wrong appearance of the PDF magnifier in some cases
* Fix truncation issues and misreported Windows versions in "Email to
  mailing list"

* Update translations