NPC refactor (#10122)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Server/NPC/Components/NPCSteeringComponent.cs

@@ -0,0 +1,60 @@
+using System.Threading;
+using Content.Server.CPUJob.JobQueues;
+using Robust.Shared.Map;
+
+namespace Content.Server.NPC.Components;
+
+/// <summary>
+/// Added to NPCs that are moving.
+/// </summary>
+[RegisterComponent]
+public sealed class NPCSteeringComponent : Component
+{
+    [ViewVariables] public Job<Queue<TileRef>>? Pathfind = null;
+    [ViewVariables] public CancellationTokenSource? PathfindToken = null;
+
+    /// <summary>
+    /// Current path we're following to our coordinates.
+    /// </summary>
+    [ViewVariables] public Queue<TileRef> CurrentPath = new();
+
+    /// <summary>
+    /// End target that we're trying to move to.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite)] public EntityCoordinates Coordinates;
+
+    /// <summary>
+    /// Target that we're trying to move to. If we have a path then this will be the first node on the path.
+    /// </summary>
+    [ViewVariables] public EntityCoordinates CurrentTarget;
+
+    /// <summary>
+    /// How close are we trying to get to the coordinates before being considered in range.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite)] public float Range = 0.2f;
+
+    /// <summary>
+    /// How far does the last node in the path need to be before considering re-pathfinding.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite)] public float RepathRange = 1.5f;
+
+    [ViewVariables] public SteeringStatus Status = SteeringStatus.Moving;
+}
+
+public enum SteeringStatus : byte
+{
+    /// <summary>
+    /// If we can't reach the target (e.g. different map).
+    /// </summary>
+    NoPath,
+
+    /// <summary>
+    /// Are we moving towards our target
+    /// </summary>
+    Moving,
+
+    /// <summary>
+    /// Are we currently in range of our target.
+    /// </summary>
+    InRange,
+}