Update dependencies and pass all clippy's (#636)

* Cargo update

https://pastebin.com/raw/KWNuJD9u

* Cargo clippy +nightly

* Remove deprecated clippy

* Fix unbalanced backtick (now passes cargo {+nightly,} clippy)

egui/src/layers.rs

@@ -157,14 +157,14 @@ impl GraphicLayers {
             for layer_id in area_order {
                 if layer_id.order == order {
                     if let Some(list) = order_map.get_mut(&layer_id.id) {
-                        all_shapes.extend(list.lock().0.drain(..));
+                        all_shapes.append(&mut list.lock().0);
                     }
                 }
             }
 
             // Also draw areas that are missing in `area_order`:
             for shapes in order_map.values_mut() {
-                all_shapes.extend(shapes.lock().0.drain(..));
+                all_shapes.append(&mut shapes.lock().0);
             }
         }
 

egui/src/lib.rs

@@ -295,7 +295,6 @@
     clippy::option_option,
     clippy::path_buf_push_overwrite,
     clippy::ptr_as_ptr,
-    clippy::pub_enum_variant_names,
     clippy::ref_option_ref,
     clippy::rest_pat_in_fully_bound_structs,
     clippy::same_functions_in_if_condition,
@@ -310,7 +309,6 @@
     clippy::unused_self,
     clippy::useless_transmute,
     clippy::verbose_file_reads,
-    clippy::wrong_pub_self_convention,
     clippy::zero_sized_map_values,
     future_incompatible,
     nonstandard_style,