Update drivers location and loading

- Extract much of server.php into a `Server` class
- Move all but the Laravel and Basic drivers into a subfolder
- Load all but the Laravel and Basic drivers via glob
- Add `beforeLoading` hook to simplify the `frontControllerPath` method for some drivers

cli/Valet/Drivers/Specific/SymfonyValetDriver.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Valet\Drivers\Specific;
+
+use Valet\Drivers\ValetDriver;
+
+class SymfonyValetDriver extends ValetDriver
+{
+    /**
+     * Determine if the driver serves the request.
+     *
+     * @param  string  $sitePath
+     * @param  string  $siteName
+     * @param  string  $uri
+     * @return bool
+     */
+    public function serves(string $sitePath, string $siteName, string $uri): bool
+    {
+        return (file_exists($sitePath.'/web/app_dev.php') || file_exists($sitePath.'/web/app.php')) &&
+               (file_exists($sitePath.'/app/AppKernel.php')) || (file_exists($sitePath.'/public/index.php')) &&
+               (file_exists($sitePath.'/src/Kernel.php'));
+    }
+
+    /**
+     * Determine if the incoming request is for a static file.
+     *
+     * @param  string  $sitePath
+     * @param  string  $siteName
+     * @param  string  $uri
+     * @return string|false
+     */
+    public function isStaticFile(string $sitePath, string $siteName, string $uri): string|false
+    {
+        if ($this->isActualFile($staticFilePath = $sitePath.'/web/'.$uri)) {
+            return $staticFilePath;
+        } elseif ($this->isActualFile($staticFilePath = $sitePath.'/public/'.$uri)) {
+            return $staticFilePath;
+        }
+
+        return false;
+    }
+
+    /**
+     * Get the fully resolved path to the application's front controller.
+     *
+     * @param  string  $sitePath
+     * @param  string  $siteName
+     * @param  string  $uri
+     * @return string
+     */
+    public function frontControllerPath(string $sitePath, string $siteName, string $uri): string
+    {
+        $frontControllerPath = null;
+
+        if (file_exists($path = $sitePath.'/web/app_dev.php')) {
+            $frontControllerPath = $path;
+        } elseif (file_exists($path = $sitePath.'/web/app.php')) {
+            $frontControllerPath = $path;
+        } elseif (file_exists($path = $sitePath.'/public/index.php')) {
+            $frontControllerPath = $path;
+        }
+
+        $_SERVER['SCRIPT_FILENAME'] = $frontControllerPath;
+
+        return $frontControllerPath;
+    }
+}