Img4Dat integrated in LDPC 1.7.7

[N. W. Perry]

I've used Img4Dat quite a bit, and would love to see it continue to be developed/refined. On the other hand, I never adopted LDPC into my workflow, so at the moment a standalone version of Img4Dat would be of more interest to me.

The top thing on my wishlist right now for patterns would be SVG to LDraw conversion, and I think this was actually intended as a future capability for Img4Dat.