update queries/commands api to accept references instead of string ids

[giogonzo]

requirements

superseeds #2
as per title. References are better for various reasons:

• don't require the id key on the query description, which is currently manual & error prone
• there's less magic & indirection: import something and use it (instead of configure something beforehand and inject it via a string id)
• this change + remove the factory wrapping #48 make it so that queries and commands can be imported and used only where actually needed (final components) -> potentially definitions for different UI parts could end up in different, split bundles, instead of being forced in the first bundle

specs

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misc

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