The Open C API interface to functions which will access character font information
in a part. Most functions require an font table entity tag (FTE tag). This
can be obtained by:

tag_t fte_tag = NULL;
UF_OBJ_cycle_objs_in_part(part_tag, UF_font_table_type, fte_tag);

The part tag can be for any part, or can be obtained by calling
UF_ASSEM_ask_work_part();

These functions allow you to:
. Add a font to the Font Table Entity.
. Query the font header structure for a specified font.
. Get the font name of a given font index number.
. Query the number of fonts in the Font Table Entity.
. Query the font number of an existing font (see UF_UGFONT_add_font).