* Tweaked filecache fallback in fileCachedPage() to try the raw title param. If the DB is down, we can get most views of titles with colons in them to work this way. Previously, it could fail on an interwiki lookup.
* Added FileCacheBase::*MissesRecent() functions for counting cache misses from different visitors.
* Made ObjectFileCache more generic.
* Cleaned up FileCacheBase::checkCacheDirs().
* Added FileCacheBase::typeSubdirectory() function and overwrote in HTMLFileCache. Fixes r98405 invalidating all existing cache due to directory change.
* Simplified FileCacheBase::checkCacheDirs() a bit
ResourceLoader:
* Use ResourceFileCache to handle load() requests, if $wgUseFileCache. Only caches requests for default language and skins. Single modules requests are always cached, whereas others require a certain threshold of traffic.
* Added ResourceFileCache class (functionality was initially to be in ObjectFileCache).
* Rewrote class and split into three classes: a base class, and html cache and a more generic cache to be used later.
* The new classes now use RequestContext.
* Renamed fetchPageText() -> fetchText().
* Split out new saveText() function from saveToFileCache().
* Various other cleanups and fixes.
Also fixed backwards setting of $wgDisableCounters in rebuildFileCache.php.
** Tweaked addAutopromoteOnceGroups() calls for performance
** Some doc tweaks and fixes
* Added NS_SPECIAL short-circuit on $wgTitle for file cache and removed unnecessary "is null" check
* Pushed "$action != 'raw'" check into HTMLFileCache
* Removed useless return value from performRequest()
* Added type hint to performAction()
