Ideally we'd just have composer.json require UtfNormal so we'd know
where it is and have an autoloader to load it for us, but that seems to
not be done in the world of MediaWiki extensions.
Previously we had been taking paths to the two data files from UtfNormal
and loading them into a stub class, but phan has started complaining
about the definition of the stub class colliding with the real UtfNormal.
So let's try loading the real UtfNormal\Validator and its data files.
Hopefully this continues to not try to pull in any other files via the
nonexistent autoloader.
Change-Id: I93baf20f0eef1892685e272793b4f99236e8c905
Its a command line script, so echoing is not an XSS. It can
do malicious things if given a malicious command line argument,
but that is by design
The last remaining phan-taint-check warning is due to a bug
in the plugin.
Bug: T202380
Change-Id: I19a07f741980a7e4d5e8458395c67523d240d221
