obsoleting legacy prop eds

src/umbraco.editorControls/MultipleTextstring/MultipleTextstringControl.cs

@@ -15,6 +15,7 @@ namespace umbraco.editorControls.MultipleTextstring
     /// The MultipleTextstring control sets a character limit on a TextBox.
     /// </summary>
     [ValidationProperty("IsValid")]
+    [Obsolete("IDataType and all other references to the legacy property editors are no longer used this will be removed from the codebase in future versions")]
     public class MultipleTextstringControl : PlaceHolder
     {
         /// <summary>

src/umbraco.editorControls/MultipleTextstring/MultipleTextstringDataType.cs

@@ -7,6 +7,7 @@ namespace umbraco.editorControls.MultipleTextstring
     /// <summary>
     /// Data Editor for the Multiple Textstring data type.
     /// </summary>
+    [Obsolete("IDataType and all other references to the legacy property editors are no longer used this will be removed from the codebase in future versions")]
     public class MultipleTextstringDataType : AbstractDataEditor
     {
         /// <summary>

src/umbraco.editorControls/MultipleTextstring/MultipleTextstringOptions.cs

@@ -1,4 +1,5 @@
-using System.ComponentModel;
+using System;
+using System.ComponentModel;
 using umbraco.cms.businesslogic.datatype;
 
 namespace umbraco.editorControls.MultipleTextstring
@@ -6,6 +7,7 @@ namespace umbraco.editorControls.MultipleTextstring
 	/// <summary>
 	/// The options for the Multiple Textstring data-type.
 	/// </summary>
+    [Obsolete("IDataType and all other references to the legacy property editors are no longer used this will be removed from the codebase in future versions")]
 	public class MultipleTextstringOptions : AbstractOptions
 	{
 		/// <summary>

src/umbraco.editorControls/MultipleTextstring/MultipleTextstringPrevalueEditor.cs

@@ -8,6 +8,7 @@ namespace umbraco.editorControls.MultipleTextstring
     /// <summary>
     /// The PreValue Editor for the Multiple Textstring data-type.
     /// </summary>
+    [Obsolete("IDataType and all other references to the legacy property editors are no longer used this will be removed from the codebase in future versions")]
     public class MultipleTextstringPrevalueEditor : AbstractJsonPrevalueEditor
     {
         /// <summary>