Include alexandria library in the project

Discard useless once-only macro and replace it by alexandria's implementation

src/utils.lisp

@@ -9,7 +9,7 @@
   (:nicknames :utils)
   (:export :it :aif :awhen
            :safe-first :safe-list
-           :group :once-only
+           :group
            :restartable
            :add-hook :remove-hook :run-hook
            :update-current-time :get-delta-time
@@ -53,14 +53,6 @@
                    (nreverse (cons source acc))))))
     (if source (rec source nil) nil)))
 
-(defmacro once-only ((&rest names) &body body)
-  "Evaluate the symbols in `names' only once, for use in a macro, as per Peter Siebel's Practical Common-Lisp."
-  (let ((gensyms (loop for n in names collect (gensym))))
-    `(let (,@(loop for g in gensyms collect `(,g (gensym))))
-       `(let (,,@(loop for g in gensyms for n in names collect ``(,,g ,,n)))
-          ,(let (,@(loop for n in names for g in gensyms collect `(,n ,g)))
-                ,@body)))))
-
 (defmacro restartable (unprotected &body body)
   "Provide a Continue restart unless `unprotected' is t."
   `(if ,unprotected

stoe.asd

@@ -19,6 +19,7 @@
   :author "Renaud Casenave-Péré"
   :license "GPL3"
   :depends-on (:swank
+               :alexandria
                :glop
                :cl-opengl)
   :components ((:module "src"