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Fetcher implementations: use callbacks

Plata Hill requested to merge plata/telly-skout:work/plata/fetcher-impl-callback into master

The fetcher implementations had to update the database and emit signals correctly. This was error prone and could not be documented properly in the FetcherImpl contract.

Add callbacks to the fetch functions and update the database and GUI (i.e. emit the signals) in one central place (Fetcher).

As a side effect, this reduces database accesses which should speed things up on slower systems (e.g. if DB access is slow such as on the PinePhone).

Edited by Plata Hill

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