Added TestContextMenuBuilderProvider for easier testing. Added Context menu to PipingCalculationContextNodePresenter. Related to Issue [WTI-172]git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@1037 5a3db67b-de53-47b5-99c8-a1c30a6650e2Former-commit-id: d7e586b8b19b2d5dcc2bf9fc0c6a4a6d8c6a762c