- Added while/endwhile and do/while syntaxes

- Fix the abstractclass requirement of parse() function

src/Method/Request.php

@@ -24,7 +24,7 @@ class Request implements Extension {
         $this->register($context);
     }
 
-    public function parse(/*\Picae\Compiler\Context*/ &$context, ?string $arguments, string $token) : string { }
+    public function parse(\Picea\Compiler\Context &$context, ?string $arguments, string $token) : string { }
 
     public function register(Context $context) : void
     {