x11/hyprshutdown: Add port: Graceful shutdown utility for Hyprland
A graceful shutdown/logout utility for Hyprland, which prevents apps
from crashing / dying unexpectedly.
Notes:
- hyprshutdown does not shut down the system, it only shuts down Hyprland.
- hyprshutdown does not work with anything other than Hyprland, as it relies on Hyprland IPC.