(Geom)Rectangle: remove code for backward compatibility

Visually it is a zero diff MR. The only changes is that rectangles output their line segments now in clockwise order starting from the top left (previously was random) - like every other GeomShape does (clockwise).

This change is need for another MR I'm working on.

Given the unfortunate large number of affected footprints, the best way to review is probably by thoroughly reviewing the code (luckily not much) and maybe 1 footprint for each generator (28).