setupBindings is called for every QmlObject created and installs various bits on the QQmlEngine, such as a network access manager, a theme icon provider, etc. However, since we use a shared QQmlEngine in various places, most of this needs to be done only once.

This splits setupBindings into a setupContext method for setting up the localized context needed for every instance and a setupEngine static function that setups an engine. A fourth constructor is added that allows to influence the setup behavior. While at it, delegating constructors are used doing both to not change behavior.

I now have the same thing done only twice instead of like 26 times. Once when the shared engine is created and another time (setupbindings in corebindingsplugin in plasma which probably can go?)

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