Implement a better management interface for Settings (#809)

app/Contracts/Repository/SettingsRepositoryInterface.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Pterodactyl\Contracts\Repository;
+
+interface SettingsRepositoryInterface extends RepositoryInterface
+{
+    /**
+     * Store a new persistent setting in the database.
+     *
+     * @param string $key
+     * @param string $value
+     * @return mixed
+     */
+    public function set(string $key, string $value);
+
+    /**
+     * Retrieve a persistent setting from the database.
+     *
+     * @param string $key
+     * @param mixed  $default
+     * @return mixed
+     */
+    public function get(string $key, $default);
+
+    /**
+     * Remove a key from the database cache.
+     *
+     * @param string $key
+     * @return mixed
+     */
+    public function forget(string $key);
+}