Make WayVR IPC independent of the built-in Wayland server

- Rename state -> wayland_state
- Move WayVR IPC server outside "wayvr" (wayland server) feature
- WayVR IPC server is now available without "wayvr" (wayland server) feature
- Remove run_compositor_at_start (run wayland server instantly)

wlx-overlay-s/src/ipc/mod.rs

@@ -0,0 +1,4 @@
+pub mod event_queue;
+pub mod events;
+pub mod ipc_server;
+pub mod signal;