Implement Acer RGB control daemon and CLI

- Removed acer-rgb.cpp and replaced it with acer-rgb-cli.cpp for command-line interface functionality.
- Added acer-rgbd.cpp to implement a daemon that manages RGB settings for keyboard, lid, and button devices.
- Introduced a socket communication mechanism via acer-rgb.sh for sending commands to the daemon.
- Created service and socket files (acer-rgbd.service and acer-rgbd.socket) for systemd integration, allowing the daemon to run as a service.
- Implemented state persistence for RGB settings in /var/lib/acer-rgbd/state.txt, enabling restoration on boot.

acer-rgbd.socket

@@ -0,0 +1,9 @@
+[Unit]
+Description=Acer RGB daemon socket
+
+[Socket]
+ListenStream=/run/acer-rgbd.sock
+SocketMode=0666
+
+[Install]
+WantedBy=sockets.target