Update copyright
Minor
Unify glyph string and array when dumping

In the spirit of the rest of DVIasm.
Minor
Cleanup dumping native font defs
Fix reading GLYPH_ARRAY/STRING from XDV files
Fix dumping GLYPH_ARRAY/STRING to text file
Read "setglyphs" from text files
Write GLYPH_ARRAY/STRING to XDV files
Fix dumping NATIVE_FONT_DEF to text file
Fix reading NATIVE_FONT_DEF from text files
Write NATIVE_FONT_DEF to XDV files