KDeclarative::setupBindings() is deprecated, replaced calls with its
implementation (setupContext + static setupEngine call), but see comment
about whether we can be sure this is done only once per engine, as
requested by the setupEngine API. It's 100% equivalent to the old code
though, can't be worse.

KPackage::contentsHash is deprecated, replaced call with implementation.

Depends on D25433 for the KActionCollection::changed signal.

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