User Registration File Upload 1.3.12

* Refactor - Backend validation for form data.
* Fix - Server side validation for max file size.
* Fix - Form Id not found in WooCommerce checkout.
* Fix - File type icon not visible in edit profile.

* Refactor - File upload method.

* Enhance - Suppors more file type like csv,ppt,xls,xlsx.
* Fix - File size validation message.
* Fix - Proper validation for deleting self uploaded file.
* Fix - Valid file not being uploaded in edit-profile page.
* Fix - Check the file exists or not before delete the file.
* Fix - Valid File Types option individual form setting not working.
* Fix - Prevent edit profile update with prevailing file upload error.
* Fix - Default file type validation when no file type validation set.