Preload class

A registry of Loaders, and the pool that runs them.

Register loaders once, then load whatever you need, whenever you need it. Each call names its own assets and hands back a PreloadRequest to watch. There is no difference between filling the cache at startup and replacing one entry later; both go through the same loaders.

Ignis.preload
  ..register(.image()..extensions(['.png']))
  ..register(.json()..extensions(['.json']));

final request = await Ignis.preload.load(manifest: true);