release stuck keys (#53)

Keys are now released when
- A client disconnects and still has pressed keys
- A client disconnects through CTLR+ALT+SHIFT+WIN
- Lan Mouse terminates with keys still being pressed through a remote client

This is also fixes an issue caused by KDE's implementation of the remote desktop portal backend:
Keys are not correctly released when a remote desktop session is closed while keys are still pressed,
causing them to be permanently stuck until kwin is restarted.

This workaround remembers all pressed keys and releases them when lan-mouse exits or a device disconnects.

closes #15

src/main.rs

@@ -65,7 +65,9 @@ fn run_service(config: &Config) -> Result<()> {
     runtime.block_on(LocalSet::new().run_until(async {
         // run main loop
         log::info!("Press Ctrl+Alt+Shift+Super to release the mouse");
-        Server::run(config).await?;
+
+        let server = Server::new(config);
+        server.run().await?;
 
         log::debug!("service exiting");
         anyhow::Ok(())