Enhancement: Use PSR-4 autoloader

[localheinz]

This pull request

• uses a PSR-4 autoloader

Follows #581.

[kamil-tekiela]

We could also use the PHP native autoloader, but we would have to get rid of the phpweb namespace as the standard one doesn't have a way to map phpweb to src as far as I know.

I think the News class should also use autoloader.

[cmb69]

Makes perfect sense to me. Thank you!

[kamil-tekiela]

Something like this would also work:

set_include_path(__DIR__.'/src/'.get_include_path());

spl_autoload_register(static function (string $class): void {
    spl_autoload(str_replace("phpweb\\", "",$class));
});

[localheinz]

@kamil-tekiela

I would not bother further optimizing the autoloading situation, especially in the light of #408.

[localheinz]

Thank you, @kamil-tekiela!