Ports /vg/ tile movement v1.0 from other repo.

Content.Shared/Movement/Components/TileMovementComponent.cs

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+using System.Numerics;
+using Content.Shared.Movement.Systems;
+using Robust.Shared.GameStates;
+using Robust.Shared.Map;
+
+namespace Content.Shared.TileMovement;
+
+/// <summary>
+/// When attached to an entity with an InputMoverComponent, all mob movement on that entity will
+/// be tile-based. Contains info used to facilitate that movement.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class TileMovementComponent : Component
+{
+    /// <summary>
+    /// Whether a tile movement slide is currently in progress.
+    /// </summary>
+    [AutoNetworkedField]
+    public bool SlideActive;
+
+    /// <summary>
+    /// Local coordinates from which the current slide first began.
+    /// </summary>
+    [AutoNetworkedField]
+    public EntityCoordinates Origin;
+
+    /// <summary>
+    /// Local coordinates of the target of the current slide.
+    /// </summary>
+    [AutoNetworkedField]
+    public Vector2 Destination;
+
+    /// <summary>
+    /// This helps determine how long a slide should last. A slide will continue so long
+    /// as a movement key (WASD) is being held down, but if it was held down for less than
+    /// a certain time period then it will continue for a minimum period.
+    /// </summary>
+    [AutoNetworkedField]
+    public TimeSpan? MovementKeyInitialDownTime;
+
+    /// <summary>
+    /// Move buttons used to initiate the current slide.
+    /// </summary>
+    [AutoNetworkedField]
+    public MoveButtons CurrentSlideMoveButtons;
+
+    /// <summary>
+    /// Local coordinates of the entity on the last physics tick.
+    /// </summary>
+    [AutoNetworkedField]
+    public Vector2 LastTickPosition;
+
+    /// <summary>
+    /// Whether this entity was weightless last physics tick.
+    /// </summary>
+    [AutoNetworkedField]
+    public bool WasWeightlessLastTick;
+}