Add installer and set data dir and user save / config dir

[MestreLion]

• Installer:
  • bindir: roguepc main launcher should go to /usr/local/games (system) or ~/.local/bin (user)
  • datadir: rogue.pic image, rogue* binaries and other launchers: /usr/local/share/roguepc or ~/.local/share/roguepc.
• configdir: For rogue.scr and rogue.opt, ~/.config/roguepc. Change score functions reading/writing to use a different path, or cd to config dir before launching.

[jwt27]

I think rogue.scr should go in /var/games/ if installed system-wide, so high scores are shared between users.

[MestreLion]

That's a good idea @jwt27 ! Do you know any games that use this in a compliant/standard way? What dir/file permissions do they set under /var/games?

[jwt27]

BSD Rogue uses this directory (package bsdgames-nonfree on Debian). The files there are owned by root:games, chmod 664, and the setgid bit on the directory is enabled. I don't know if the group name is something Debian-specific or standardised.