GFX control, no-tokio, no-async, dbus client refactor

- Working gfx modes <iGPU only, dGPU only, or hybrid>
- Add signal for gfx vendor change and make CLI wait for signal
- Add polling for led brightness to save to config
- Move daemon to zbus crate
- dbus client refactor
- Further dbus methods and updates
- Add basic notification user daemon and systemd service

asus-nb/examples/ball.rs

@@ -93,6 +93,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         writer.write_colour_block(&colours)?;
 
         // can change 100 times per second, so need to slow it down
-        //std::thread::sleep(std::time::Duration::from_millis(30));
+        std::thread::sleep(std::time::Duration::from_millis(30));
     }
 }