SEW, DST and EXP supported

I found some descriptions of additional embroidery formats on the web: Janome’s SEW, which is a simplified JEF format (actually its predecessor), Melco’s EXP and Tajima’s DST: Both are mainly used for industrial embroidery machines and don’t hold any color information.

Both plugins (StitchBuddy-QL and StitchBuddy-MD) are updated to read this formats.