(Update) Refactor General and Staff Controllers

- Remove all facades use besides mail
- Use Dependency Injection for Illuminate\Http\Request
- use helpers for auth, cache, validator, and more to rid of facades use
- use $request->input() over $request->get()
- use $request->isMethod('POST') over $request->getMethod('POST')
- general cleanup

app/Http/Controllers/Staff/FlushController.php

@@ -13,9 +13,6 @@
 namespace App\Http\Controllers\Staff;
 
 use App\Http\Controllers\Controller;
-use Illuminate\Support\Facades\Request;
-use Illuminate\Support\Facades\Validator;
-
 use App\Peer;
 use App\History;
 use \Toastr;