devkitPPC release 31

[WinterMute]

devkitPPC release 31 is now available via pacman. Use sudo (dkp-)pacman -Syu to update or sudo (dkp-)pacman -S devkitPPC to install.

This is also available in the docker image at https://hub.docker.com/u/devkitpro/

• Added clock functions and enabled std::chrono support.
• Added hook for nanosleep, implementing usleep & sleep from there.
• enabled std::filesystem support.
• Implement aligned_alloc.
• Implement scandir.

With thanks to exjam for patches and inspiration.

libogc still needs some updates to use the hooks which will be done soon.