Cleaned up branch "single_config" a bit and added TODOs.
- Moved all config classes to package "org.vadere.util.config". - Renamed: * "ExperimentalResources" to "VadereConfig". * "ConfigurationSection" to "IConfigSection". * "INIConfigurationSection" to "IniConfigSection". - Revised "config.ini" (renamed keys and deleted unnecessary keys).