Introduce performInitialUpdate to allow disabling updates during view controller building #147
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This change allows disabling the initial update that occurs within
buildViewController, which is not desired for container view controllers in many cases: When your container view controller (eg, nav stack, tab bar) creates itsDescribedViewControllersin init, they are already updated with their content. Disabling the update duringbuildViewControllerallows us to skip duplicate updates to them that end up occurring immediately after.Checklist