Import `dprint_r` and `dieprint_r` to the library.
These functions allow to enclose a print_r call in a preformatted block,
so the output could be read directly in a rendered HTML document.
They are intended to be used as debug time.
As these global functions are still in use during some current debug
and development tasks, we offer a mechanism to register them from the
Debugger class. As `create_function` is deprecated since PHP 7.2.0,
the selected method is to require a wrapper file in the global space.
The result is a choice between those two syntaxes: