api to set a font "source" (blank is normal filing system) but the source can
be a device or file etc. in this case it currently supports eet files as the
source and then the font name is used as a key in th eet file as to where to
find the font - edb support would be trivial to add. :) if the font is not
found in the "source" it falls back to the font path etc.
SVN revision: 8625