U4-8569 Saving a member type changes the UniqueId of custom properties

This fixes the member property type UniqueID SQL and mapping.
This ensures that the main repositories fully assert/compare all fetched properties.

src/Umbraco.Core/Models/Content.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Linq;
 using System.Reflection;
 using System.Runtime.Serialization;
@@ -155,6 +156,7 @@ namespace Umbraco.Core.Models
         /// Language of the data contained within this Content object.
         /// </summary>
         [Obsolete("This is not used and will be removed from the codebase in future versions")]
+        [EditorBrowsable(EditorBrowsableState.Never)]
         public string Language
         {
             get { return _language; }

src/Umbraco.Core/Models/IContent.cs

@@ -1,4 +1,5 @@
 using System;
+using System.ComponentModel;
 using System.Diagnostics;
 using Umbraco.Core.Persistence.Mappers;
 
@@ -21,6 +22,7 @@ namespace Umbraco.Core.Models
         bool Published { get; }
 
         [Obsolete("This will be removed in future versions")]
+        [EditorBrowsable(EditorBrowsableState.Never)]
         string Language { get; set; }
 
         /// <summary>

src/Umbraco.Core/Models/Rdbms/PropertyTypeReadOnlyDto.cs

@@ -51,5 +51,8 @@ namespace Umbraco.Core.Models.Rdbms
 
         [Column("dbType")]
         public string DbType { get; set; }
+
+        [Column("UniqueID")]        
+        public Guid UniqueId { get; set; }
     }
 }

src/Umbraco.Core/Persistence/Factories/MemberTypeReadOnlyFactory.cs

@@ -114,7 +114,8 @@ namespace Umbraco.Core.Persistence.Factories
                         ValidationRegExp = typeDto.ValidationRegExp,
                         PropertyGroupId = new Lazy<int>(() => tempGroupDto.Id.Value),
                         CreateDate = memberType.CreateDate,
-                        UpdateDate = memberType.UpdateDate
+                        UpdateDate = memberType.UpdateDate,
+                        Key = typeDto.UniqueId
                     };
                     //on initial construction we don't want to have dirty properties tracked
                     // http://issues.umbraco.org/issue/U4-1946
@@ -166,7 +167,8 @@ namespace Umbraco.Core.Persistence.Factories
                     ValidationRegExp = typeDto.ValidationRegExp,
                     PropertyGroupId = null,
                     CreateDate = dto.CreateDate,
-                    UpdateDate = dto.CreateDate
+                    UpdateDate = dto.CreateDate,
+                    Key = typeDto.UniqueId
                 };
                 
                 propertyTypes.Add(propertyType);

src/Umbraco.Core/Persistence/Repositories/MemberTypeRepository.cs

@@ -94,7 +94,7 @@ namespace Umbraco.Core.Persistence.Repositories
             }
 
             sql.Select("umbracoNode.*", "cmsContentType.*", "cmsPropertyType.id AS PropertyTypeId", "cmsPropertyType.Alias",
-                "cmsPropertyType.Name", "cmsPropertyType.Description", "cmsPropertyType.mandatory",
+                "cmsPropertyType.Name", "cmsPropertyType.Description", "cmsPropertyType.mandatory", "cmsPropertyType.UniqueID",
                 "cmsPropertyType.validationRegExp", "cmsPropertyType.dataTypeId", "cmsPropertyType.sortOrder AS PropertyTypeSortOrder",
                 "cmsPropertyType.propertyTypeGroupId AS PropertyTypesGroupId", "cmsMemberType.memberCanEdit", "cmsMemberType.viewOnProfile",
                 "cmsDataType.propertyEditorAlias", "cmsDataType.dbType", "cmsPropertyTypeGroup.id AS PropertyTypeGroupId",