Feature: Dispatch PSR-14 event ModifySelectedContractsEvent in ProfilesController::selectedContractsAction() 

Description 

ProfileController::selectedContractsAction() dispatches now the new PSR-14 ModifySelectedContractsEvent.

The event provides following methods:

• getContracts(): QueryResultInterface return current result set.
• setContracts(QueryResultInterface $contracts): void to allow setting a custom resultset.
• getView(): FluidViewInterface|CoreViewInterface return the current view to allow assigning custom values to the view.
• getPluginControllerActionContext(): PluginControllerActionContextInterface to provide more context information