Vehicle stun/sleep immunity fix (#18962)

* Fix stuns on vehicles

* Unicycle 1984

* Fix sleeping and driving

* Discard that too

Content.Shared/Buckle/SharedBuckleSystem.Buckle.cs

@@ -131,6 +131,16 @@ public abstract partial class SharedBuckleSystem
 
     private void OnBuckleStandAttempt(EntityUid uid, BuckleComponent component, StandAttemptEvent args)
     {
+        //Let entities stand back up while on vehicles so that they can be knocked down when slept/stunned
+        //This prevents an exploit that allowed people to become partially invulnerable to stuns
+        //while on vehicles
+
+        if (component.BuckledTo != null)
+        {
+            var buckle = component.BuckledTo;
+            if (TryComp<VehicleComponent>(buckle, out _))
+                return;
+        }
         if (component.Buckled)
             args.Cancel();
     }

Content.Shared/Movement/Systems/SharedMoverController.cs

@@ -20,6 +20,7 @@ using System.Numerics;
 using Content.Shared.Mobs.Systems;
 using Robust.Shared.Physics.Components;
 using Robust.Shared.Physics.Systems;
+using Content.Shared.Bed.Sleep;
 
 namespace Content.Shared.Movement.Systems
 {
@@ -123,6 +124,7 @@ namespace Content.Shared.Movement.Systems
             if (RelayTargetQuery.TryGetComponent(uid, out var relayTarget))
             {
                 if (_mobState.IsIncapacitated(relayTarget.Source) ||
+                    TryComp<SleepingComponent>(relayTarget.Source, out _) ||
                     !MoverQuery.TryGetComponent(relayTarget.Source, out var relayedMover))
                 {
                     canMove = false;

Resources/Prototypes/Entities/Objects/Vehicles/buckleable.yml

@@ -374,7 +374,6 @@
   description: It only has one wheel!
   components:
   - type: Vehicle
-    useHand: false
     northOver: true
     southOver: true
     northOverride: -0.15