Automatically print a backtrace or capture a crash dump on crash

[AbigailBuccaneer]

Most crash reports on the issue tracker don't contain much interesting info. They'd be much easier to hunt down if Colobot used something like libbacktrace to dump a stack trace.

Is this something that Colobot devs would be interested in? If so, I'm happy to make a pull request that dumps the stack under Linux and Windows.

[krzys-h]

I'm pretty sure there was a discussion about that when I was implementing the 'unhandled exception' dialog. If you can make something that would be portable across all platforms and compilers we support that would be really appreciated (Windows/Linux/Mac on gcc/Clang/MSVC/mingw2/MXE)

Possibly related: #567, #571, #572, #590