Log Message:
xfce4-netload-plugin: update to 1.4.0

Change log:

1.4.0
======
- Add new icons and switch to rDNS naming
- Add "About" dialog
- Add help button to properties dialog
- Improve progressbar look
- Update URLs from goodies.x.o to docs.x.o (Bug #16170)
- Fix compilation warnings
- autoconf: AM_CONFIG_HEADER -> AC_CONFIG_HEADERS
- Update `.gitignore`
- Fix missing-prototypes
- Remove GSourceFunc casts
- Populate a combo box with known network interfaces
- remove unused wormulon files
- Move to common m4 versioning macros
- Fix type for media_list on OpenBSD
- Add basic GitLab pipeline
- Translation Updates:
  Albanian, Basque, Belarusian, Chinese (Taiwan), Danish, Eastern
  Armenian, English (Canada), Finnish, Galician, Hebrew, Hungarian,
  Interlingue, Russian, Slovak, Slovenian, Spanish, Swedish, Turkish,
  Uyghur