* Made Resources.php return a pure-data array instead of an ugly mix of data and...

* Made Resources.php return a pure-data array instead of an ugly mix of data and code. This allows the class code to be lazy-loaded with the autoloader, for a performance advantage especially on non-APC installs. And using the convention where if the class is omitted, ResourceLoaderFileModule is assumed, the registration code becomes shorter and simpler.
* Modified ResourceLoader to lazy-initialise module objects, for a further performance advantage.
* Deleted ResourceLoader::getModules(), provided getModuleNames() instead. Although the startup module needs this functionality, it's slow to generate, so to avoid misuse, it's better to provide a foolproof fast interface and let the startup module do the slow thing itself.
* Modified ResourceLoader::register() to optionally accept an info array instead of an object.
* Added $wgResourceModules, allowing extensions to efficiently define their own resource loader modules. The trouble with hooks is that they contain code, and code is slow. We've been through all this before with i18n. Hooks are useful as a performance tool only if you call them very rarely.
* Moved ResourceLoader settings to their own section in DefaultSettings.php
* Added options to ResourceLoaderFileModule equivalent to the $localBasePath and $remoteBasePath parameters, to allow it to be instantiated via the new array style. Also added remoteExtPath, which allows modules to be registered before $wgExtensionAssetsPath is known.
* Added OutputPage::getResourceLoader(), mostly for debugging.
* The time saving at the moment is about 5ms per request with no extensions, which is significant already with 6 load.php requests for a cold cache page view. This is a much more scalable interface; the relative saving will grow as more extensions are added which use this interface, especially for non-APC installs.

Although the interface is backwards compatible, extension updates will follow in a subsequent commit.