WiP movement prediction.

Content.Shared/GameObjects/Components/Movement/IMoverComponent.cs

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+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+
+namespace Content.Shared.GameObjects.Components.Movement
+{
+    // Does nothing except ensure uniqueness between mover components.
+    // There can only be one.
+    public interface IMoverComponent : IComponent
+    {
+        /// <summary>
+        ///     Movement speed (m/s) that the entity walks.
+        /// </summary>
+        float CurrentWalkSpeed { get; }
+
+        /// <summary>
+        ///     Movement speed (m/s) that the entity sprints.
+        /// </summary>
+        float CurrentSprintSpeed { get; }
+
+
+        /// <summary>
+        ///     The movement speed (m/s) of the entity when it pushes off of a solid object in zero gravity.
+        /// </summary>
+        float CurrentPushSpeed { get; }
+
+        /// <summary>
+        ///     How far an entity can reach (in meters) to grab hold of a solid object in zero gravity.
+        /// </summary>
+        float GrabRange { get; }
+
+        /// <summary>
+        ///     Is the entity Sprinting (running)?
+        /// </summary>
+        bool Sprinting { get; }
+
+        /// <summary>
+        ///     Calculated linear velocity direction of the entity.
+        /// </summary>
+        (Vector2 walking, Vector2 sprinting) VelocityDir { get; }
+
+        GridCoordinates LastPosition { get; set; }
+
+        float StepSoundDistance { get; set; }
+
+        /// <summary>
+        ///     Toggles one of the four cardinal directions. Each of the four directions are
+        ///     composed into a single direction vector, <see cref="PlayerInputMoverComponent.VelocityDir"/>. Enabling
+        ///     opposite directions will cancel each other out, resulting in no direction.
+        /// </summary>
+        /// <param name="direction">Direction to toggle.</param>
+        /// <param name="subTick"></param>
+        /// <param name="enabled">If the direction is active.</param>
+        void SetVelocityDirection(Direction direction, ushort subTick, bool enabled);
+
+        void SetSprinting(ushort subTick, bool enabled);
+
+    }
+}