Add Culmus foundry to the vendor list

Add Culmus foundry to the vendor list

Maps fonts produced by the Culmus project <http://culmus.sourceforge.net>
to the XLFD foundry name culmus.

For TrueType fonts, maps the vendor code CLM from the TrueType vendor id field.

For Type1 fonts, which use heuristics to guess mappings to XLFD foundries from
words in the copyright notice, add the names of the main contributors to
the Culmus product to recognize the fonts under their copyright.

Patch from Maxim Iorsh