rcc automatically compresses resources above a certain size, but as
we found out the hard way, loading compressed resources from python
fails and may even coredump. As a workaround, force-disable compression
on resources in python code (c++ code seems to be fine compressed or not),
which re-enables several workbenches (most notably: Draft) at the cost
of a few megabytes of disk space.
Reported by: jeff@
MFH: 2020Q2
following r531601 (Qt 5.14.2), PySide2 can be updated, too
- pyside2-tools don't bring their own pyside2-rcc and pyside2-uic but
use Qt's rcc and uic - patch cad/freecad to handle that
- remove Python 2 support: it's going to go away soon anyway, it did
complicate these ports a lot, and it would have required more
workarounds in FreeCAD when using Qt's rcc instead of the old pyside2-rcc.
- while here, do some polishing in freecad's makefile
