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This reverts commit f50dd62a.

Many things listen to this signal, we better only emit it when it actually
changed.

Changes the search strategy into one that will fetch all backends in
parallel. When a same resource is reported twice, the one coming from the
backend selected as preferable for applications will be used.
Duplication matching is done using the appstream id, so it's very important
that application backends support it.

They get removed from the model through their status, they get added by
the class who requested them. Will allow for simpler code and more
semantics for the Transactions.

We'll still need to be notified about its end

It's more realistic.
Prepares ResourcesProxyModel for other useful use-cases

It will be used on the initial page and when searching

Both packagekit and flatpak back-ends had an action for refreshing the db
that would collide on Ctrl+R. Now we have 1 action that will call all the
backends to refresh.
Translators: Note this moves around the i18n() call

CCMAIL: kde-i18n-doc@kde.org

This provides some very light user feedback when the update check
has not been completed. It ensures that we don't get told there
are no updates, when we don't really know yet whether we really do.

End result is that this patch sets the text "Checking for
updates..." on the Update sidebar entry when we're fetching things.

This also introduces a minor fix to the KNS backend, which on
errors would otherwise end up in a perpetual fetching state.

Differential Revision: https://phabricator.kde.org/D5046

This way we can more easily standardize around ids, leverage on the naming
used for kpackage handlers

Also stop treating it like a model because we're not using it as such

Otherwise it's an initialization mess

Desktop files for plugins won't be required anymore, as this was only used
for KNS, but we don't want to statically load categories anymore.
KNS will load its different backends having its own factory, based on
whichever knsrc files are present in the system.

While we want fresh results in the beginning, it's to be expected that later
results will be of less interest.

Offer resources in bulk, so we don't have to refresh the UI that often

Otherwise we return 0B for PackageKit resources, which looks wonky

BUG: 365236

In general that would be by KNS

Now we were holding the fetching property while downloading updates and
such. After this patch, we'll fetch them and notify as such afterwards.

Let the transaction itself deal with it