Ensures all resolvers are sealed. Changes CacheRefreshersResolver, DataTypesResolver, MacroFieldEditorsResolver, PackageActionsResolver, ActionsResolver

to all be lazy resolvers as they are not needed instantly on app startup (not needed by the front-end) This will
make app startup a lot quicker. Fixes ActionsResolver to not use the PluginManager to resolve the types when it
is instantiating them since these are passed in the ctor. Updates all unit tests to use lazy delegate for these resolvers
and they are all passing.

src/Umbraco.Core/ObjectResolution/LazyManyObjectsResolverbase.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
 using System.Web;
 
 namespace Umbraco.Core.ObjectResolution
@@ -83,6 +84,7 @@ namespace Umbraco.Core.ObjectResolution
 		private readonly List<Lazy<Type>> _lazyTypeList = new List<Lazy<Type>>();
 		private readonly List<Func<IEnumerable<Type>>> _listOfTypeListDelegates = new List<Func<IEnumerable<Type>>>();
 		private List<Type> _resolvedTypes = null;
+		private readonly ReaderWriterLockSlim _typeResolutionLock = new ReaderWriterLockSlim();
 		
 		/// <summary>
 		/// Used for unit tests
@@ -99,7 +101,7 @@ namespace Umbraco.Core.ObjectResolution
 		{
 			get
 			{
-				using (var lck = GetUpgradeableReadLock())
+				using (var lck = new UpgradeableReadLock(_typeResolutionLock))
 				{
 					var lazyTypeList = _lazyTypeList.Select(x => x.Value).ToArray();
 					var listofTypeListDelegates = _listOfTypeListDelegates.SelectMany(x => x()).ToArray();