Remove all code related to the CSV importer in preparation of #262

Signed-off-by: James Cole <thegrumpydictator@gmail.com>

app/Helpers/Csv/Mapper/Budget.php

@@ -1,42 +0,0 @@
-<?php
-/**
- * Budget.php
- * Copyright (C) 2016 thegrumpydictator@gmail.com
- *
- * This software may be modified and distributed under the terms
- * of the MIT license.  See the LICENSE file for details.
- */
-
-declare(strict_types = 1);
-namespace FireflyIII\Helpers\Csv\Mapper;
-
-use Auth;
-use FireflyIII\Models\Budget as BudgetModel;
-
-/**
- * Class Budget
- *
- * @package FireflyIII\Helpers\Csv\Mapper
- */
-class Budget implements MapperInterface
-{
-
-    /**
-     * @return array
-     */
-    public function getMap(): array
-    {
-        $result = Auth::user()->budgets()->get(['budgets.*']);
-        $list   = [];
-
-        /** @var BudgetModel $budget */
-        foreach ($result as $budget) {
-            $list[$budget->id] = $budget->name;
-        }
-        asort($list);
-
-        $list = [0 => trans('firefly.csv_do_not_map')] + $list;
-
-        return $list;
-    }
-}