Laravel 8 shift squash & merge (#3029)

* Temporarily moved back config path
* Apply Laravel coding style
* Shift exception handler
* Shift HTTP kernel and middleware
* Shift service providers
* Convert options array to fluent methods
* Shift to class based routes
* Shift console routes
* Ignore temporary framework files
* Shift to class based factories
* Namespace seeders
* Shift PSR-4 autoloading
* Shift config files
* Default config files
* Shift Laravel dependencies
* Shift return type of base TestCase methods
* Shift cleanup
* Applied stylci style changes
* Reverted config files location
* Applied manual changes to Laravel 8 shift

Co-authored-by: Shift <shift@laravelshift.com>

tests/ThemeTest.php

@@ -150,7 +150,7 @@ class ThemeTest extends TestCase
         Theme::listen(ThemeEvents::AUTH_REGISTER, $callback);
         $this->setSettings(['registration-enabled' => 'true']);
 
-        $user = factory(User::class)->make();
+        $user = User::factory()->make();
         $this->post('/register', ['email' => $user->email, 'name' => $user->name, 'password' => 'password']);
 
         $this->assertCount(2, $args);