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.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;