Gtk4 port - Proposed 4.alpha.1
This is a proposed first alpha GHex release featuring GTK 4 support. It is close to a rewrite in most areas, but some areas, such as the hex-document portion of the gtkhex library, are more or less straight ports to the new APIs.
As a result, this will require some substantial testing and translation updates.
For a more detailed summary of changes and known issues, see the NEWS file as modified with this MR.