Inject new Paths class instead of Application

This (and similar work in other areas) will allow us to further
reduce the API surface of the Application class.

Separation of concerns etc.

src/Database/Console/MigrateCommand.php

@@ -13,6 +13,7 @@ use Flarum\Console\AbstractCommand;
 use Flarum\Database\Migrator;
 use Flarum\Extension\ExtensionManager;
 use Flarum\Foundation\Application;
+use Flarum\Foundation\Paths;
 use Flarum\Settings\SettingsRepositoryInterface;
 use Illuminate\Contracts\Container\Container;
 use Illuminate\Database\ConnectionInterface;
@@ -26,18 +27,18 @@ class MigrateCommand extends AbstractCommand
     protected $container;
 
     /**
-     * @var Application
+     * @var Paths
      */
-    protected $app;
+    protected $paths;
 
     /**
      * @param Container $container
-     * @param Application $application
+     * @param Paths $paths
      */
-    public function __construct(Container $container, Application $application)
+    public function __construct(Container $container, Paths $paths)
     {
         $this->container = $container;
-        $this->app = $application;
+        $this->paths = $paths;
 
         parent::__construct();
     }
@@ -91,8 +92,8 @@ class MigrateCommand extends AbstractCommand
         $this->info('Publishing assets...');
 
         $this->container->make('files')->copyDirectory(
-            $this->app->vendorPath().'/components/font-awesome/webfonts',
-            $this->app->publicPath().'/assets/fonts'
+            $this->paths->vendor.'/components/font-awesome/webfonts',
+            $this->paths->public.'/assets/fonts'
         );
     }
 }

src/Database/MigrationServiceProvider.php

@@ -10,6 +10,7 @@
 namespace Flarum\Database;
 
 use Flarum\Foundation\AbstractServiceProvider;
+use Flarum\Foundation\Paths;
 use Illuminate\Filesystem\Filesystem;
 
 class MigrationServiceProvider extends AbstractServiceProvider
@@ -26,7 +27,7 @@ class MigrationServiceProvider extends AbstractServiceProvider
         $this->app->bind(MigrationCreator::class, function () {
             return new MigrationCreator(
                 $this->app->make(Filesystem::class),
-                $this->app->basePath()
+                $this->app->make(Paths::class)->base
             );
         });
     }