- Added the application feature - a big reason why Lean was created in the first place.

- Began moving some repetitive parts from projects to projects into lean

src/ControllerTrait.php

@@ -29,7 +29,7 @@ use function file_get_contents;
  */
 trait ControllerTrait {
     
-    public Session $session; 
+    public Session $session;
     
     public ? Picea\Picea $picea;
 
@@ -37,7 +37,7 @@ trait ControllerTrait {
 
     public array $contextList = [];
 
-    public function __construct(? Picea\Picea $picea, Session $session, ? MailerInterface $mailer = null) {
+    public function __construct(? Picea\Picea $picea = null, ? Session $session = null, ? MailerInterface $mailer = null) {
         $this->picea = $picea;
         $this->session = $session;
         $this->mailer = $mailer;