User Registration Advanced Fields 1.6.12

* Enhance - Remove profile image file from directory when user is deleted.
* Enhance - Profile Picture upload to `user_registration_uploads/profile-pictures` folder.
* Enhance - Remove profile image file from directory when profile image is removed by user.
* Tweak - Profile picture upload method.
* Tweak - Incremental file name for duplicate files.
* Tweak - Update `user_registration_profile_pic_url` user meta from url to attachment id.

* Fix - Html display in visual switch of editor.
* Fix - Profile Picture default max size changed to ini value.

* Dev - Added custom filter for profile picture resolution.
* Dev - Custom hooks added for prepopulate.