Consolidate third-party plugins into Assets/Plugins

Move and consolidate many third-party plugin files and metadata from various locations (notably Assets/Third Parties/Plugins 1 and scattered Opsive/Photon folders) into a unified Assets/Plugins directory. Includes DOTween, PrimeTween, Native/BackroomsNoise, Sirenix/Odin Inspector, and Opsive UltimateCharacterController/shared libs, plus updates to several .meta files and removal of obsolete installer/legacy files. This standardizes plugin layout and cleans up duplicate/obsolete assets.

Assets/Third Parties/Opsive/UltimateCharacterController/Scripts/SurfaceSystem/SurfaceIdentifier.cs

@@ -0,0 +1,24 @@
+/// ---------------------------------------------
+/// Ultimate Character Controller
+/// Copyright (c) Opsive. All Rights Reserved.
+/// https://www.opsive.com
+/// ---------------------------------------------
+
+namespace Opsive.UltimateCharacterController.SurfaceSystem
+{
+    using UnityEngine;
+
+    /// <summary>
+    /// The SurfaceIdentifier can be added to GameObjects and identifies the type of surface the object belongs to.
+    /// </summary>
+    public class SurfaceIdentifier : MonoBehaviour
+    {
+        [Tooltip("The SurfaceType of the object.")]
+        [SerializeField] protected SurfaceType m_SurfaceType;
+        [Tooltip("Are decals allowed on this object?")]
+        [SerializeField] protected bool m_AllowDecals = true;
+
+        public SurfaceType SurfaceType { get { return m_SurfaceType; } }
+        public bool AllowDecals { get { return m_AllowDecals; } }
+    }
+}