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/main.rs

@@ -22,6 +22,7 @@ mod config;
 mod config_io;
 mod graphics;
 mod gui;
+mod ipc;
 mod overlays;
 mod shaders;
 mod state;