All the following associations are ignored if `NOICE_OPENER` is exported.
- Associate plain text files with vim (using `file` command)
- Remove video file associations (to each his own favourite video player)
- - Associate common audio file types with lightweight fmedia (http://fmedia.firmdev.com/)
+ - Associate common audio file types with lightweight [fmedia](http://fmedia.firmdev.com/)
- Associate PDF files with zathura
- Removed less
- Use environment variable `NOICE_FALLBACK_OPENER` to open other non-associated files