Part of this ticket is to:

• define a common interface for all registries to be used. For this to work the registry items have to have a similar or common interface as well.
• For features like Autosuggest, validation, config app, etc we need a why to store meta information about the config node. This information is either tied to the registry or the item.
• The individual registry managers should be replaced by a more source oriented way. Therefore we need a common source interface for JCR and YAML at the moment.
• All registries should be accessible over one registry facade (or registry of registries). This facade will at least be used for the new config app.