feat: Add a new convertAdvanced option

It allows user to convert videos to several other audio/video formats

Fixes #148

tests/FrontControllerTest.php

@@ -517,6 +517,27 @@ class FrontControllerTest extends TestCase
         );
     }
 
+    /**
+     * Test the redirect() function with an advanced conversion.
+     *
+     * @return void
+     */
+    public function testRedirectWithAdvancedConversion()
+    {
+        $this->config->convertAdvanced = true;
+        $this->assertRequestIsOk(
+            'redirect',
+            [
+                'url'           => 'https://www.youtube.com/watch?v=M7IpKCZ47pU',
+                'format'        => 'best',
+                'customConvert' => 'on',
+                'customBitrate' => 32,
+                'customFormat'  => 'flv',
+            ],
+            $this->config
+        );
+    }
+
     /**
      * Test the locale() function.
      *