Context steering for NPCs (#12915)

Content.Shared/NPC/SharedNPCSteeringSystem.cs

@@ -0,0 +1,16 @@
+namespace Content.Shared.NPC;
+
+public abstract class SharedNPCSteeringSystem : EntitySystem
+{
+    public const byte InterestDirections = 12;
+
+    /// <summary>
+    /// How many radians between each interest direction.
+    /// </summary>
+    public const float InterestRadians = MathF.Tau / InterestDirections;
+
+    /// <summary>
+    /// How many degrees between each interest direction.
+    /// </summary>
+    public const float InterestDegrees = 360f / InterestDirections;
+}