New upstream release.

* Run wrap-and-sort -a.
* Refresh manpage for new upstream release.
* Refresh patches for new upstream release.
* debian/control:
  - remove pygtk dependency, upstream moved to GTK 3 as part of the 3.0
    release (Closes: #885261).
 - add missing python-chardet, python-gi, python-requests and python-scandir dependencies.
  - Bump Standards-Version to 4.4.1.
* debian/install: add rule to install data/app-menu.ui