Deprecate IActionBlocker in favour of cancellable events (#4193)

* Deprecate IActionBlocker in favour of cancellable events

* Bring back old speech/emoting component restrictions

* Rename action blocker listener methods

* Use Entity System public methods instead of extension methods

Co-authored-by: Vera Aguilera Puerto <gradientvera@outlook.com>

Content.Shared/Movement/EntitySystems/SharedMobMoverSystem.cs

@@ -0,0 +1,41 @@
+#nullable enable
+using Content.Shared.Movement.Components;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Maths;
+using Robust.Shared.Physics;
+using Robust.Shared.Physics.Collision;
+using Robust.Shared.Physics.Dynamics;
+
+namespace Content.Shared.Movement.EntitySystems
+{
+    public sealed class SharedMobMoverSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+            Get<SharedPhysicsSystem>().KinematicControllerCollision += HandleCollisionMessage;
+        }
+
+        public override void Shutdown()
+        {
+            base.Shutdown();
+            Get<SharedPhysicsSystem>().KinematicControllerCollision -= HandleCollisionMessage;
+        }
+
+        /// <summary>
+        ///     Fake pushing for player collisions.
+        /// </summary>
+        private void HandleCollisionMessage(Fixture ourFixture, Fixture otherFixture, float frameTime, Manifold manifold)
+        {
+            var otherBody = otherFixture.Body;
+
+            if (otherBody.BodyType != BodyType.Dynamic || !otherFixture.Hard) return;
+
+            var normal = manifold.LocalNormal;
+
+            if (!ourFixture.Body.Owner.TryGetComponent(out IMobMoverComponent? mobMover) || normal == Vector2.Zero) return;
+
+            otherBody.ApplyLinearImpulse(-normal * mobMover.PushStrength * frameTime);
+        }
+    }
+}