Shop as a Customer for WooCommerce 1.2.9

* moved plugin setting into woocommerce setting
* added extra tab of(switch to guest) to setting tabs
* switch back will redirect to Plugin setting page
* Whatsapp button will be disable for users with no phone number
* Changed table styles to WooCommerce table styles
* Added options to Switch Role in New Tab or Same Tab

* resolved User roles value was not saved in database correctly

* resolved compatibility issue with multilanguages