Move budget rollover types to enum class.

app/Enums/AutoBudgetType.php

@@ -0,0 +1,31 @@
+<?php
+/*
+ * AutoBudgetType.php
+ * Copyright (c) 2022 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace FireflyIII\Enums;
+
+/**
+ * Enum AutoBudgetType
+ */
+enum AutoBudgetType: int
+{
+    case AUTO_BUDGET_RESET = 1;
+    case AUTO_BUDGET_ROLLOVER = 2;
+}

app/Models/AutoBudget.php

@@ -64,11 +64,6 @@ use Illuminate\Support\Carbon;
  */
 class AutoBudget extends Model
 {
-    /** @var int When the auto-budget resets every period automatically. */
-    public const AUTO_BUDGET_RESET = 1;
-    /** @var int When the auto-budget adds an amount every period automatically */
-    public const AUTO_BUDGET_ROLLOVER = 2;
-
     use SoftDeletes;
 
     /**