Loader.pack will allow you to load in a new Phaser Asset Pack JSON file. An Asset Pack is a specially structured file that allows you to define all assets for your game in an external file. The file can be split into sections, allowing you to control loading a specific set of files from it. An example JSON file can be found in the `resources` folder and examples of use in the Phaser Examples repository.
Loader.totalQueuedPacks returns the number of Asset Packs in the queue.
Loader.totalLoadedPacks returns the number of Asset Packs already loaded.