Remove lifetime from the Event

Lifetimes don't work nicely when dealing with multithreaded environments
in the current design of the existing winit's event handling model, so
remove it in favor of `InnerSizeWriter` fences passed to client, so they
could try to update the size.

Fixes #1387.

src/platform_impl/macos/window_delegate.rs

@@ -442,7 +442,7 @@ impl WinitWindowDelegate {
         }
     }
 
-    pub(crate) fn queue_event(&self, event: WindowEvent<'static>) {
+    pub(crate) fn queue_event(&self, event: WindowEvent) {
         let event = Event::WindowEvent {
             window_id: WindowId(self.window.id()),
             event,