792c711e8a
The following MIME icons have been completely removed because they were
not used (they were probably added/kept by mistake):
- clip-353 --> It was added in MDL-75362 by mistake.
- edit
- env
- explore
- folder-open
- help
- move
- parent
Apart from removing these MIME icons, a PHPUnit test has been added to
guarantee MIME icons in pix/f are under control and they are only
added/removed when needed.