Refactor rest extensions #70
Description
At the moment Tea Commerce use the old base and have rest extentions, e.g. used with form post
https://github.com/TeaCommerce/Tea-Commerce-for-Umbraco/blob/770705bdea8f20fd9e146c27724c9a830454c8e0/Source/TeaCommerce.Umbraco.Web/RestExtensions.cs
It seems this still is available in Umbraco v7 https://github.com/umbraco/Umbraco-CMS/tree/dev-v7/src/Umbraco.Core/Configuration/BaseRest but in Umbraco v8 is seems this has been removed and it either should use Web API or the Rest API to support v8, but there are probably also other parts which need to be refactored, because of the legacy stuff in Umbraco, which has been removed.
https://github.com/umbraco/Umbraco-CMS/tree/temp8/src/Umbraco.Core/Configuration