This package consists mostly of command-line tools, but there are also two qt5-based image viewers (`mrview` and `shview`). I have provided an option `withGui = true` to allow users to disable these viewers. They work on NixOS but unlikely to work out-of-the box on non-NixOS Linux (see #62169), but I've refrained from asserting that they shouldn't be built since a user might want to fiddle with runtime GL stuff.

Some programs rely on FSL and/or ANTs backends; I have somewhat heavy-handedly wrapped all binaries to point to ANTs, while FSL is not available in Nix at the moment and has a non-commercial license so would be convenient to disable by default for Hydra builds.

python27Packages.jug: 1.6.9 -> 2.0.0

mapnik: 3.0.22 -> 3.0.23

Set dontDropIconThemeCache so the gtk setup hook doesn't remove the
icon cache.

pythonPackages.pysaml2: fix tests on 32bit systems

imageworsener: init at 1.3.3

The aws-vault development has switched to using go modules.
Therefore this package has also been updated to use `buildGoModule`
helper.

beamPackages.hex: 0.20.1 -> 0.20.5

mate.mate-themes: 3.22.20 -> 3.22.21

termshark: 1.0.0 -> 2.1.1

mrtrix: init at 3.0_RC3_latest

This workaround is no longer required as the bug requiring it has been
fixed in poetry2nix.

exiftool: 11.70 -> 11.85

poetry2nix: 1.4.0 -> 1.5.0