[LDPE] 1.8.90 Released (drag and drop shortcuts / abs. subfile references)

[Nils Schmidt]

I still have my issue of disappearing edge line while NOT using  OpenGL 3.3 (see https://forums.ldraw.org/thread-28431-po...l#pid55623). So I switched to OpenGL 3.3 to be able to see the lines, but discovered another little quirk of that mode: LDPE doesn't switch to  "special condline mode" when I try to add a condline.

Thanks, I created an issue (#1124). It should be trivial to fix.