WayVR: Layouting system, state changing feedback, process userdata, various IPC changes

WayVR:
- Layouting system (tiled and stacked)

IPC:
- Implemented routes: `WvrDisplaySetWindowLayout`, `WvrDisplayWindowList`, `WvrWindowSetVisible`, `WvrProcessGet`,

- Packet broadcasting
- State change feedback to the client (displays/windows/processes)

src/backend/openvr/mod.rs

@@ -338,7 +338,11 @@ pub fn openvr_run(running: Arc<AtomicBool>, show_by_default: bool) -> Result<(),
         };
 
         #[cfg(feature = "wayvr")]
-        crate::overlays::wayvr::tick_events::<OpenVrOverlayData>(&mut state, &mut overlays)?;
+        if let Err(e) =
+            crate::overlays::wayvr::tick_events::<OpenVrOverlayData>(&mut state, &mut overlays)
+        {
+            log::error!("WayVR tick_events failed: {:?}", e);
+        }
 
         log::trace!("Rendering frame");