the Chromebooks share their file system to Linux using the 9p file
system, which does not support setting file ownership. Newly PrusaSlicer
will detect platform and it will not panick if copy_file() cannot set
file ownership after copying. It just logs the incident, and on
chromebooks the loglevel for that incident is "Info", not "Error".
Adjusted the full screen mode to contain menu bar.
Moved Platform.cpp/hpp to libslic3r
boost::process::spawn() sets SIGCHLD to SIGIGN for the child process, thus if a child PrusaSlicer spawns another
subprocess and the subrocess dies, the child PrusaSlicer will not receive information on end of subprocess
(posix waitpid() call will always fail).
https://jmmv.dev/2008/10/boostprocess-and-sigchld.html
The child instance of PrusaSlicer has to reset SIGCHLD to its default, so that posix waitpid() and similar continue to work.
Fixes#5507
Implemented try/catch blocks for Slic3r exceptions and std::exceptions
with GUI error reporting. This is extremely important to report
corruption of PrusaSlicer.ini.