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`

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)
     }
 }

src/platform_impl/web/monitor.rs

@@ -1,4 +1,5 @@
 use crate::dpi::{PhysicalPosition, PhysicalSize};
+use crate::monitor::VideoMode;
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Handle;
@@ -12,11 +13,16 @@ impl Handle {
         unimplemented!();
     }
 
-    pub fn dimensions(&self) -> PhysicalSize {
-        unimplemented!();
-    }
-
     pub fn name(&self) -> Option<String> {
         unimplemented!();
     }
+
+    pub fn size(&self) -> PhysicalSize {
+        unimplemented!();
+    }
+
+    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
+        // TODO: is this possible ?
+        std::iter::empty()
+    }
 }