[Player] Add AI Pathfinding on a 2D grid to the player character

Assets/External/AstarPathfindingProject/Navmesh/NavmeshUpdates.cs

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+using UnityEngine;
+using System.Collections.Generic;
+using Pathfinding.Util;
+using Pathfinding.Serialization;
+#if UNITY_5_5_OR_NEWER
+using UnityEngine.Profiling;
+#endif
+
+namespace Pathfinding {
+	/// <summary>
+	/// Helper for navmesh cut objects.
+	/// Responsible for keeping track of which navmesh cuts have moved and coordinating graph updates to account for those changes.
+	///
+	/// See: navmeshcutting (view in online documentation for working links)
+	/// See: <see cref="AstarPath.navmeshUpdates"/>
+	/// See: <see cref="Pathfinding.NavmeshBase.enableNavmeshCutting"/>
+	/// </summary>
+	[System.Serializable]
+	public class NavmeshUpdates {
+		/// <summary>
+		/// How often to check if an update needs to be done (real seconds between checks).
+		/// For worlds with a very large number of NavmeshCut objects, it might be bad for performance to do this check every frame.
+		/// If you think this is a performance penalty, increase this number to check less often.
+		///
+		/// For almost all games, this can be kept at 0.
+		///
+		/// If negative, no updates will be done. They must be manually triggered using <see cref="ForceUpdate"/>.
+		///
+		/// <code>
+		/// // Check every frame (the default)
+		/// AstarPath.active.navmeshUpdates.updateInterval = 0;
+		///
+		/// // Check every 0.1 seconds
+		/// AstarPath.active.navmeshUpdates.updateInterval = 0.1f;
+		///
+		/// // Never check for changes
+		/// AstarPath.active.navmeshUpdates.updateInterval = -1;
+		/// // You will have to schedule updates manually using
+		/// AstarPath.active.navmeshUpdates.ForceUpdate();
+		/// </code>
+		///
+		/// You can also find this in the AstarPath inspector under Settings.
+		/// [Open online documentation to see images]
+		/// </summary>
+		public float updateInterval;
+
+		internal class NavmeshUpdateSettings {
+			public NavmeshUpdateSettings(NavmeshBase graph) {}
+			public void OnRecalculatedTiles (NavmeshTile[] tiles) {}
+		}
+		internal void Update () {}
+		internal void OnEnable () {}
+		internal void OnDisable () {}
+	}
+}