Issue #2901730 by mfernea, ankitjain28may, idebr: Fix 'Squiz.WhiteSpace.FunctionSpacing' coding standard

Issue #2958785 by abramm: ContextDefinition isSatisfiedBy() check fails for context using inherited class

Issue #2671964 by EclipseGc, tim.plunkett, Jo Fitzgerald, larowlan, fago, dawehner, Berdir, phenaproxima: ContextHandler cannot validate constraints