Remove Phpunit/Dbunit

- Introduce own Yaml-to-SQL class
- Introduce new way of MySQL-DB-tests (per rollback)
- Remove dependency phpunit/dbunit
- Introduce new dev-dependency for YAML-ready (Symfony YAML reader)

tests/Util/Database/YamlDataSet.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Friendica\Test\Util\Database;
+
+use Friendica\Database\Database;
+use Symfony\Component\Yaml\Yaml;
+
+/**
+ * Util class to load YAML files into the database
+ */
+class YamlDataSet
+{
+	/**
+	 * @var array
+	 */
+	private $tables = [];
+
+	public function __construct(string $yamlFile)
+	{
+		$this->addYamlFile($yamlFile);
+	}
+
+	public function addYamlFile(string $yamlFile)
+	{
+		$data = Yaml::parse(file_get_contents($yamlFile));
+
+		foreach ($data as $tableName => $rows) {
+			if (!isset($rows)) {
+				$rows = [];
+			}
+
+			if (!is_array($rows)) {
+				continue;
+			}
+
+			foreach ($rows as $key => $value) {
+				$this->tables[$tableName][$key] = $value;
+			}
+		}
+	}
+
+	public function load(Database $database)
+	{
+		foreach ($this->tables as $tableName => $rows) {
+			foreach ($rows as $row) {
+				$database->insert($tableName, $row);
+			}
+		}
+	}
+}