Recently the ConfigurationRender was modified to have no-special handling about system properties and threads.
Instead of methods, these configurations are now printed by SystemPropertiesPrinter & ThreadPrinter, which are internal classes.
Since these classes are static, they can be easily converted from inner classes, to top-level classes, in the same packages.
This will eventually make the code of both printers and the ConfigurationRender smaller, and easier to read. This way future improvements to the printers will be much easier to implement.