Merge branch 'sev/unifont_update' into 'master'

Unifont update

This branch updates the GNU Unifont from version 5.1 to version 7.0.06.
It also makes two changes which I consider useful:

- Remove the version string from the font file name.
This way, any future updates will not invalidate all references to the font. A problem that is illustrated with this update.

- Move the Unifont to a dedicated package. Currently, individual copies are added to the other font packages.
This causes a lot of redundancy. More importantly, it gives the impression that this is necessary for custom fonts as well,
causing more redundancy and inconsistencies if the unifont is shared in custom font pk3 archives.
This change also eliminates possible confusions about authorship of the fonts.

See merge request !7