Precache All Files (or certain directories) for x chunks

#1

Perhaps add an option where you can precache all files (either in certain or all directories) to cache a amount of chunks. For instance: Enable precaching at 5 chunks per file so movies/music/shows start up instantly. Of course, you should be able to adjust how much precache you would want in the config (5 chunks per file, etc.). Also, if using rclone config, show the potential space it’ll take up on the given cache drive. Perhaps add this feature to the cache mount options?