* Fix - User's essays and assignments posts do not get deleted permanently when the data erasure request is executed.
* Security - Tightened security around REST API.
* Security - Tightened security around assignments & essays files.
* Tweak - Changed assignment files uploading path to `uploads/learndash/assignments`.
* Tweak - Changed essay files uploading path to `uploads/learndash/essays`.
* Tweak - Made essay and assignment file links dynamic.
* Tweak - Added filters: `learndash_file_can_be_downloaded`, `learndash_file_protection_paths`.
* Tweak - Added functions: `learndash_assignment_get_download_url`, `learndash_quiz_essay_get_download_url`.
* Tweak - Deprecated classes: `LD_REST_Posts_Gutenberg_Controller`.
* Tweak - Deprecated filters: `learndash_rest_wp_archive_repsonse`, `learndash_rest_wp_archive_viewable`.
* Tweak - Updated filters: `learndash_assignment_process_init`, `learndash_essay_upload_dirbase`, `learndash_essay_upload_urlbase`, `learndash_fileupload_process`, `learndash_upload_assignment_init`.
* Tweak - Updated functions: , `learndash_add_new_essay_response`, `learndash_before_delete_essay`, `learndash_delete_user_data`, `learndash_essay_fileupload_process`, `learndash_essay_permissions`.
* Tweak - Updated templates: `ld30/templates/assignment/partials/row.php`, `ld30/templates/shortcodes/profile/assignment-row.php`, `themes/legacy/templates/learndash_lesson_assignment_uploads_list.php`.
