Updated validator definitions, updated ToXml logic to take into account new Property Editors, added Serialization and Deserialization methods

for property editor's to override if necessary, updated the ContentItemBinder to bind the db and dto models so now that validator filter
just validates against the model and doesn't actually do any data lookups itself (much nicer). Now saves and retreives from the database !!

src/Umbraco.Web/Models/Mapping/ContentModelMapper.cs

@@ -40,7 +40,7 @@ namespace Umbraco.Web.Models.Mapping
                                     Description = p.PropertyType.Description,
                                     Label = p.PropertyType.Name,
                                     Config = _applicationContext.Services.DataTypeService.GetPreValuesByDataTypeId(p.PropertyType.DataTypeDefinitionId),
-                                    Value = p.Value.ToString(),
+                                    Value = editor.ValueEditor.SerializeValue(p.Value),
                                     View = editor.ValueEditor.View
                                 };
                         })