Change function to be pcm_icon instead of icon

src/Twig/Extension/IconExtension.php

@@ -16,7 +16,7 @@ final class IconExtension extends AbstractExtension
     public function getFunctions(): array
     {
         return [
-            new TwigFunction('icon', [IconRuntime::class, 'renderIcon'])
+            new TwigFunction('pcm_icon', [IconRuntime::class, 'renderIcon'])
         ];
     }
 }