Revert "Reintroduce ProtoBuf and use it for inventory caching too. ZeroFormatter wasn't working out."

This reverts commit 0ce9e654ec.
Revert "Silly Cinder. Don't serialize InventoryNodeDictionary"

This reverts commit 30f3bf0ea8.
Revert "Serialize Permissions and one more ProtoBuf fix for InventoryNode"

This reverts commit 26992406c5.

LibreMetaverse.Types/UUID.cs

@@ -1,6 +1,5 @@
 /*
  * Copyright (c) 2006-2016, openmetaverse.co
- * Copyright (c) 2021, Sjofn LLC.
  * All rights reserved.
  *
  * - Redistribution and use in source and binary forms, with or without
@@ -27,7 +26,6 @@
 
 using System;
 using System.Security.Cryptography;
-using ProtoBuf;
 
 namespace OpenMetaverse
 {
@@ -36,11 +34,9 @@ namespace OpenMetaverse
     /// Life networking protocol
     /// </summary>
     [Serializable]
-    [ProtoContract]
     public struct UUID : IComparable<UUID>, IEquatable<UUID>
     {
         /// <summary>The System.Guid object this struct wraps around</summary>
-        [ProtoMember(1)]
         public Guid Guid { get; set; }
 
         #region Constructors