Use packageFiles feature to replace special-purpose RL modules

Use packageFiles feature to replace special-purpose RL modules

For config vars, add a virtual package file called 'config.js', and use
require( './config.js' ) in the module. For most data modules, add a
virtual package file called 'data.js', use require( './data.js' ) in the
module. Where needed, add wrapper files that put the data in the
relevant global object and in module.exports.

LanguageDataModule is the only special-purpose module not being removed
in this commit, because it uses languageScripts, and those are not
compatible with packageFiles (yet).

Also merge mediawiki.ForeignStructuredUpload.config into
mediawiki.ForeignStructuredUpload, since that was the only thing that
used it.

Change-Id: I203d4e3ecdeeeb16729eba2dcf40d11a41d2e582