In some cases, GLib.get_user_special_dir() can return NULL
when asked for DIRECTORY_TEMPLATES. In that case, DING will
fail.

This MR fixes it.

Fix https://gitlab.com/rastersoft/desktop-icons-ng/-/issues/182

Don't fail if DIRECTORY_TEMPLATES returns null

Closes #182

See merge request rastersoft/desktop-icons-ng!206

Slovak translation update

See merge request rastersoft/desktop-icons-ng!207

Added Ukrainian Language

See merge request rastersoft/desktop-icons-ng!211

Integration with other extensions (simplified version)

See merge request rastersoft/desktop-icons-ng!212

The code presumes that file-roller is installed, so if it isn't,
an exception is generated which can result in problems with the
right-click menu.

This patch fixes it.

Fix https://gitlab.com/rastersoft/desktop-icons-ng/-/issues/187

Fix exception if File-Roller is not installed

Closes #187

See merge request rastersoft/desktop-icons-ng!217

Due to several re-uploads to Gnome Extensions, the version
number there is greater than the one in Gitlab.

This MR fixes this.