V2 Overhaul

Better late than never!

Pit Crew has been heavily refactored to be smoother to use and easier to extend.

• Request file is now stored in /run like it should have been to begin with.
• pitcrew.service now restarts the display manager using its real path rather than the display-manager.service symlink, to work around a strange LightDM behavior.
• Added a second shim, crystalball.sh, which starts Looking Glass, Scream and virt-manager if the request file is present.
• gpuset has been refactored in preparation to add support for other vendors.
• Installer script has been added for convenience. I feel like it's pretty safe as I've tested it both on my root system and the fake-root it installs to by default, but proceed with caution, as you would with anything that overhand-lobs executable files all over your file system. (Crystal Ball is currently not installed automatically, as it's intended to be used with your favourite autostart mechanism.)

yeehaw

Just in case you don't know how to download a repository despite being savvy enough to get far enough to be able to use this godforsaken thing