Re-adding Skybrud.Essentials dependency as we need it

The "Cast" and "ToList" extension methods from Skybrud.Essentials are essential (no pun intented) to outputting the correct property values.

Author: abjerner

src/Skybrud.Umbraco.MultiNodeTreePicker/PropertyEditors/ValueConverters/MntpValueConverter.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Skybrud.Essentials.Collections.Extensions;
+using Skybrud.Essentials.Json.Extensions;
 using Skybrud.Umbraco.MultiNodeTreePicker.Composers;
 using Skybrud.Umbraco.MultiNodeTreePicker.Converters;
 using Umbraco.Cms.Core;
@@ -55,7 +57,7 @@ public override object ConvertIntermediateToObject(IPublishedElement owner, IPub
 
             if (propertyType.DataType.Configuration is MntpConfiguration config && config.ItemConverter != null) {
 
-                string key = config.ItemConverter.GetValue("key").ToString();
+                string key = config.ItemConverter.GetString("key");
 
                 if (_converterCollection.TryGet(key, out IMntpItemConverter converter)) {
 
@@ -67,8 +69,8 @@ public override object ConvertIntermediateToObject(IPublishedElement owner, IPub
 
                         return (value as IEnumerable<IPublishedElement> ?? new IPublishedElement[0])
                             .Select(x => converter.Convert(propertyType, x))
-                            //.Cast<type>()
-                            .ToList();
+                            .Cast(type)
+                            .ToList(type);
 
                     }
 
@@ -86,7 +88,7 @@ public override Type GetPropertyValueType(IPublishedPropertyType propertyType) {
 
             if (propertyType.DataType.Configuration is MntpConfiguration config && config.ItemConverter != null) {
 
-                string key = config.ItemConverter.GetValue("key").ToString();
+                string key = config.ItemConverter.GetString("key");
 
                 if (_converterCollection.TryGet(key, out IMntpItemConverter converter)) {
 

src/Skybrud.Umbraco.MultiNodeTreePicker/Skybrud.Umbraco.MultiNodeTreePicker.csproj

@@ -28,6 +28,7 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="Skybrud.Essentials" Version="1.1.33" />
         <PackageReference Include="Umbraco.Cms.Core" Version="9.0.0" />
         <PackageReference Include="Umbraco.Cms.Web.Website" Version="9.0.0" />
         <PackageReference Include="Umbraco.Cms.Web.BackOffice" Version="9.0.0" />