Fix web errors (#1040)

* Fix old `use` declarations

* Fix hidden lifetime parameter

* Fix missing methods in `web::Monitor`.

Originally fixed by @ryanisaacg in 94387c4bf5bca35f4e24562ce89a4f4badd53aa8.

* Disable some tests and examples on `wasm32`

examples/proxy.rs

@@ -1,10 +1,11 @@
-use winit::{
-    event::{Event, WindowEvent},
-    event_loop::{ControlFlow, EventLoop},
-    window::WindowBuilder,
-};
-
+#[cfg(not(target_arch = "wasm32"))]
 fn main() {
+    use winit::{
+        event::{Event, WindowEvent},
+        event_loop::{ControlFlow, EventLoop},
+        window::WindowBuilder,
+    };
+
     let event_loop: EventLoop<i32> = EventLoop::new_user_event();
 
     let _window = WindowBuilder::new()
@@ -35,3 +36,8 @@ fn main() {
         }
     });
 }
+
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    panic!("Example not supported on Wasm");
+}