Use autoloader for PHP data files instead of include/require

Use autoloader for PHP data files instead of include/require

Move ZhConversion.php and Names.php to languages/data and make them both
expose their data as static class variables instead of in the local
scope. This means that the autoloader can be used to load the data,
which is efficient and secure. This also makes additional request-local
caching of the arrays unnecessary.

Change-Id: Iafb96ac4165d0965fcb9a69f1d0a91139ea9790c