Fix web errors (#1040)

* Fix old `use` declarations

* Fix hidden lifetime parameter

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

Originally fixed by @ryanisaacg in 94387c4bf5.

* Disable some tests and examples on `wasm32`

src/platform_impl/web/error.rs

@@ -4,7 +4,7 @@ use std::fmt;
 pub struct OsError(pub String);
 
 impl fmt::Display for OsError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}", self.0)
     }
 }