Fixes data type pre-value issues with MNTP, removes unecessary contentpicker.html and memberpicker.html overlays since treepicker.html is all that should be used, cleans up the treepicker one to be more inline with our current angular standards. Removes uneeded event handling from treepicker

src/Umbraco.Core/PropertyEditors/ConfigurationField.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using Newtonsoft.Json;
 using Umbraco.Core.IO;
@@ -63,6 +64,12 @@ namespace Umbraco.Core.PropertyEditors
         [JsonIgnore]
         public string PropertyName { get; set; }
 
+        /// <summary>
+        /// Gets or sets the property clr type of the field.
+        /// </summary>
+        [JsonIgnore]
+        public Type PropertyType { get; set; }
+
         /// <summary>
         /// Gets or sets the description of the field.
         /// </summary>