Working on configurable folder/device defaults, I noticed we do not ensure that the local device is always added to folders. We only check that when creating a new config, which is kind of useless. Adding that check requires the wrapper to know about it's own - which is why all the files not in lib/config changed. And working on Configuration.prepare made my head spin, so I decided to split that up into smaller functions and methods on the sub-types. And while at it, I changed util.SetDefaults to recurse into structs, such that we only need to call it once at the top-level (the current way is repetitive and prone to error by forgetting a member).