[LDPatternCreator] Release 1.7.6 (improved triangle auto-completion)

[Takeshi Takahashi]

Thank you for releasing LDPC, a my must-have tool for part authoring of printed ones.

I'd like 2-4chrd to be added into "Add Primitive" list (also tndis).
It is far more useful than currently existing 2-4disc.

Thanks in advance,
Takeshi