Comply with rust-lang/rfcs#2140

https://github.com/rust-lang/rfcs/issues/2140

--- common/systems/src/mount.rs.orig	2023-09-05 08:33:57.917799000 +0200

+++ common/systems/src/mount.rs	2023-09-05 08:36:25.244098000 +0200

@@ -61,7 +61,7 @@ impl<'a> System<'a> for Sys {

                         .map(|c| (

                             // Only take inputs and actions from the rider if the mount is not intelligent (TODO: expand the definition of 'intelligent').

                             if !matches!(body, Some(Body::Humanoid(_))) {

-                                let actions = c.actions.drain_filter(|action| match action {

+                                let actions = c.actions.extract_if(|action| match action {

                                     ControlAction::StartInput { input: i, .. }

                                     | ControlAction::CancelInput(i) => matches!(i, InputKind::Jump | InputKind::Fly | InputKind::Roll),

                                     _ => false

@@ -151,7 +151,7 @@ impl<'a> System<'a> for Sys {

             let inputs = controllers.get_mut(entity).map(|c| {

                 let actions: Vec<_> = c

                     .actions

-                    .drain_filter(|action| match action {

+                    .extract_if(|action| match action {

                         ControlAction::StartInput { input: i, .. }

                         | ControlAction::CancelInput(i) => {

                             matches!(i, InputKind::Jump | InputKind::Fly | InputKind::Roll)

--- common/systems/src/lib.rs.orig	2023-09-05 08:33:14.168102000 +0200

+++ common/systems/src/lib.rs	2023-09-05 08:33:25.834926000 +0200

@@ -1,4 +1,4 @@

-#![feature(drain_filter, let_chains)]

+#![feature(extract_if, let_chains)]

 #![allow(clippy::option_map_unit_fn)]

 mod aura;

--- common/src/lib.rs.orig	2023-09-05 08:27:02.430168000 +0200

+++ common/src/lib.rs	2023-09-05 08:27:12.840524000 +0200

@@ -14,7 +14,7 @@

     arbitrary_self_types,

     int_roundings

 )]

-#![feature(hash_drain_filter)]

+#![feature(hash_extract_if)]

 pub use common_assets as assets;

 pub use uuid;

--- network/protocol/src/quic.rs.orig	2023-09-05 08:30:57.788439000 +0200

+++ network/protocol/src/quic.rs	2023-09-05 08:39:54.845952000 +0200

@@ -388,7 +388,7 @@ where

             // try to order pending

             let mut pending_violated = false;

             let mut reliable = vec![];

-            self.pending_reliable_buffers.drain_filter(|(_, buffer)| {

+            self.pending_reliable_buffers.extract_if(|(_, buffer)| {

                 // try to get Sid without touching buffer

                 let mut testbuffer = buffer.clone();

                 match ITFrame::read_frame(&mut testbuffer) {

--- network/protocol/src/lib.rs.orig	2023-09-05 08:30:10.685261000 +0200

+++ network/protocol/src/lib.rs	2023-09-05 08:30:46.426039000 +0200

@@ -1,4 +1,4 @@

-#![feature(drain_filter)]

+#![feature(extract_if)]

 //! Network Protocol

 //!

 //! a I/O-Free protocol for the veloren network crate.

--- server/src/persistence/character_updater.rs.orig	2023-09-05 08:37:55.535451000 +0200

+++ server/src/persistence/character_updater.rs	2023-09-05 08:38:15.126505000 +0200

@@ -267,7 +267,7 @@ impl CharacterUpdater {

     }

     pub fn process_batch_completion(&mut self, completed_batch_id: u64) {

-        self.pending_database_actions.drain_filter(|_, event| {

+        self.pending_database_actions.extract_if(|_, event| {

             matches!(event, DatabaseAction::Submitted {

                     batch_id,

             } if completed_batch_id == *batch_id)

--- server/src/lib.rs.orig	2023-09-05 08:37:33.129297000 +0200

+++ server/src/lib.rs	2023-09-05 08:40:23.982003000 +0200

@@ -3,13 +3,13 @@

 #![deny(clippy::clone_on_ref_ptr)]

 #![feature(

     box_patterns,

-    drain_filter,

+    extract_if,

     let_chains,

     never_type,

     option_zip,

     unwrap_infallible

 )]

-#![feature(hash_drain_filter)]

+#![feature(hash_extract_if)]

 pub mod automod;

 mod character_creator;

--- voxygen/src/lib.rs.orig	2023-09-05 08:41:11.688447000 +0200

+++ voxygen/src/lib.rs	2023-09-05 08:41:21.838058000 +0200

@@ -5,7 +5,7 @@

 #![feature(

     array_methods,

     array_zip,

-    drain_filter,

+    extract_if,

     trait_alias,

     option_get_or_insert_default,

     map_try_insert,

--- voxygen/src/scene/mod.rs.orig	2023-09-05 08:47:16.999196000 +0200

+++ voxygen/src/scene/mod.rs	2023-09-05 08:47:23.905291000 +0200

@@ -763,7 +763,7 @@ impl Scene {

         renderer.update_consts(&mut self.data.lights, lights);

         // Update event lights

-        self.event_lights.drain_filter(|el| {

+        self.event_lights.extract_if(|el| {

             el.timeout -= dt;

             el.timeout <= 0.0

         });

--- voxygen/src/scene/math.rs.orig	2023-09-05 08:46:56.195615000 +0200

+++ voxygen/src/scene/math.rs	2023-09-05 08:47:06.240539000 +0200

@@ -250,7 +250,7 @@ pub fn clip_object_by_plane<T: Float + MulAdd<T, T, Ou

     tolerance: T,

 ) {

     let mut intersection_points = Vec::new();

-    polys.drain_filter(|points| {

+    polys.extract_if(|points| {

         let len = intersection_points.len();

         let outside_first = clip_points_by_plane(points, plane, &mut intersection_points);

         // Only remember intersections that are not coplanar with this side; i.e. those