Merge from vendor branch TNF:

Merge from vendor branch TNF:
Import Xournal 0.4.5 as editors/xournal.
Contributed by Matthew Mondor in PR pkg/44169

Xournal is an application for notetaking, sketching, keeping a
journal using a stylus or a mouse.  It is free software (GNU GPL)
and runs on GTK+/Gnome platforms.  It is similar to Jarnal, Gournal,
and NoteLab.

Xournal allows to add annotations to PDF documents, including notes,
multicolor highlighting and simple drawing, and can save those in
another filename (distinguished by the suffix), to automatically
load them back when opening the PDF document again.  It also
remembers the previous page position.