Introduction of the GameConfiguration model

This commit introduces the GameConfiguration, a model that is not an
entity. It also introduces GameConfigurationElement which is a doctrine
entity.
The two models make use of the traits introduced for CharacterProperty.
They also use the new OneToManyCollection class, which implements the
doctrine collection interface to a certain, limited extend. It mimicks
doctrine's PersisentCollection.

tests/Models/GameConfigurationTest.php

@@ -0,0 +1,54 @@
+<?php
+declare(strict_types=1);
+
+namespace LotGD\Core\Tests\Models;
+
+use LotGD\Core\Models\GameConfiguration;
+use LotGD\Core\Tests\ModelTestCase;
+
+/**
+ * Tests the management of CharacterScenes
+ */
+class GameConfigurationTest extends ModelTestCase
+{
+    /** @var string default data set */
+    protected $dataset = "gameConfiguration";
+    
+    public function testGetConfiguration()
+    {
+        $configuration = new GameConfiguration($this->getEntityManager());
+        
+        $this->assertSame("hallo", $configuration->get("default_test", "hallo"));
+        $this->assertSame(87897, $configuration->get("default_test_int", 87897));
+        
+        $this->assertSame("Legend of the Green Dragon", $configuration->get("gameName", "Daenerys"));
+        $this->assertSame("1.0.5.6", $configuration->get("gameVersion", "1.0"));
+        $this->assertSame(30, $configuration->get("maxPlayerOnline", 100));
+        $this->assertSame(30.4, $configuration->get("testFloat", 100.123512));
+        
+        $this->getEntityManager()->flush();
+    }
+    
+    public function datasetSetAndGet() {
+        return [
+            ["testOne", 15],
+            ["testTwo", "256"]
+        ];
+    }
+    
+    /**
+     * Tests setting settings and fetching them back from the database
+     * @dataProvider datasetSetAndGet
+     * @param string $key
+     * @param mixed $value
+     */
+    public function testSetAndGet(string $key, $value)
+    {
+        $configuration = new GameConfiguration($this->getEntityManager());
+        
+        $configuration->set($key, $value);
+        $this->getEntityManager()->flush();
+        $this->getEntityManager()->clear();
+        $this->assertSame($value, $configuration->get($key, null));
+    }
+}