Kill all buffers displayed in a perspective when killing it

Previously, only file buffers from the projectile project were killed.
org notes and processes were not killed.
All the buffers appearing in the window-conf of the perspective are now killed as well.

projectorg.el

@@ -89,11 +89,21 @@ And switch to a perspective for the project."
       (persp-switch (projectile-project-name (projectile-project-root FILENAME)))
         (projectile-add-known-project (projectile-project-root FILENAME))))
 
+(defun tree-alist-get-all (key list acc)
+  (cond ((or (not list) (not (listp list))) nil)
+        ((eq key (car list)) (cons (cadr list) acc))
+        (t (append (tree-alist-get-all key (car list) acc) (tree-alist-get-all key (cdr list) acc)))))
+
+(defun persp-kill-all-buffers (persp-name)
+  (mapc '(lambda (buffer) (when (get-buffer buffer) (kill-buffer buffer)))
+          (tree-alist-get-all 'buffer (persp-window-conf (persp-get-by-name persp-name)) nil)))
+
 (defun projectorg/remove-from-project-list ()
   (interactive)
   (let ((proj (projectile-project-name)))
     (projectile-remove-current-project-from-known-projects)
     (projectile-kill-buffers)
+    (persp-kill-all-buffers proj)
     (persp-kill proj)))
 
 (defun projectorg/counsel-org-capture (&optional from-buffer)