Dynamic config loading

- Move settings, defaults and dbstructure to directory 'static'
- Dynamic loading of config files (after the static loading)
- Filter out '-sample.config.php' and '-sample.ini.php' files
- Remove unnecessary ConfigFileManager
- Move ConfigFileLoader to Utils
- Add tests for multi-loading for INI, config and sample-filtering

tests/datasets/config/B.config.php

@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * A test file for local configuration
+ *
+ */
+
+return [
+	'database' => [
+		'hostname' => 'testhost',
+		'username' => 'testuser',
+		'password' => 'testpw',
+		'database' => 'testdb',
+		'charset' => 'utf8mb4',
+	],
+
+	'config' => [
+		'admin_email' => 'admin@overwritten.local',
+		'sitename' => 'Friendica Social Network',
+		'register_policy' => \Friendica\Module\Register::OPEN,
+		'register_text' => '',
+	],
+	'system' => [
+		'default_timezone' => 'UTC',
+		'language' => 'en',
+		'theme' => 'frio',
+		'newKey' => 'newValue',
+	],
+];

tests/datasets/config/B.ini.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * A test local ini file
+ */
+
+return <<<INI
+
+[database]
+hostname = testhost
+username = testuser
+password = testpw
+database = testdb
+
+[system]
+theme = changed
+newKey = newValue
+
+[config]
+admin_email = admin@overwritten.local
+INI;