ECS NPCs (#9941)

* ECS

* A

* parity

* Remove dummy update

* abs

* thanks rider

Content.Server/AI/EntitySystems/NPCSystem.Blackboard.cs

@@ -0,0 +1,42 @@
+using System.Diagnostics.CodeAnalysis;
+using Content.Server.AI.Components;
+
+namespace Content.Server.AI.EntitySystems;
+
+public sealed partial class NPCSystem
+{
+    /*
+    /// <summary>
+    /// Tries to get the blackboard data for a particular key. Returns default if not found
+    /// </summary>
+    public T? GetValueOrDefault<T>(NPCComponent component, string key)
+    {
+        if (component.BlackboardA.TryGetValue(key, out var value))
+        {
+            return (T) value;
+        }
+
+        return default;
+    }
+
+    /// <summary>
+    /// Tries to get the blackboard data for a particular key.
+    /// </summary>
+    public bool TryGetValue<T>(NPCComponent component, string key, [NotNullWhen(true)] out T? value)
+    {
+        if (component.BlackboardA.TryGetValue(key, out var data))
+        {
+            value = (T) data;
+            return true;
+        }
+
+        value = default;
+        return false;
+    }
+
+    /*
+    * Constants to make development easier
+    */
+
+    public const string VisionRadius = "VisionRadius";
+}