Wayland's eventloop 2.0 (#790)

* match unix common API to evl 2.0

* wayland: eventloop2.0

* make EventLoopProxy require T: 'static

* Fix linux build and tests

* wayland: update sctk & small fixes

tests/send_objects.rs

@@ -4,7 +4,7 @@ fn needs_send<T:Send>() {}
 
 #[test]
 fn event_loop_proxy_send() {
-    fn is_send<T: Send>() {
+    fn is_send<T: 'static + Send>() {
         // ensures that `winit::EventLoopProxy` implements `Send`
         needs_send::<winit::event_loop::EventLoopProxy<T>>();
     }