Fix for PP scripts not working on UNIX when $SHELL is undefined thanks @jfbauer432 for pointing the problem out. thanks @lukasmatena for fixing it in PrusaSlicer (commit 87a5116) Co-authored-by: Lukáš Matěna <lukasmatena@seznam.cz>
Fix build warnings on windows, fix various bugs/logic errors/missing returns/etc, update boost::bind.
using version 1.0.10